Hope it's OK and was just a one-off. Body language is not her consideration, it's your work (unless body language IS related to your PhD). I hate things like that. Someone shouted at me twice on a temp job recently when I couldn't have known what I was doing, and it was just bad on her part even though I was nearly in tears at the time.

In most questions you have to steer them round to how you fit the job specification e.g. introduce yourself: say how your experience fits the job, how you could be of benefit to the company.
It might be worth finding someone who has been through similar interviews, or approaching the careers service. prospects does careers advice too.
If you build up some answers you can probably just adapt for each specific job. If 70K is at stake, maybe a few hours is worth it?

The cost of living is much higher and you can live very poorly on £20K.
You can buy books on interviews, I actually got one at a charity shop. There are some guides online, and some agencies help too.

I would read up on the work the lab does and be able to talk a bit about it and show that you are interested.
It depends on the supervisor, some supervisors may still take you on without experience. Mine took on a physicist with no knowledge of the area and limited English! He's someone who leaves the student to work it out too!
I did a computer project as an undergrad and didn't have the experience/links to get a PhD, but got one after a year (I temped for 6 months in an office).
You could always try a masters course with lab project if you can't find some experience, some of the richer/larger labs may have some money. It would be worth emailing round a department asking. You can also do official studentships e.g. by RSC.
You could also just go and talk to supervisors for advice, and not just ask them for a PhD, you never know they might even offer one

My supervisor has now read most of my thesis and will pay £100 if I miss the departmental deadline as it was out of my control. He's accepted I need to move on and is actually working on it. I do have a lot of corrections/scribblings now to work on, so it could be August. I have 2 tests for job applications and only about a week to do them as well.

Good news. I've had a temp job for this week but met my supervisor briefly this week. He will pay me £100 if I miss the departmental deadline, and accepts I need to finish and move on

You don't neccesarily need experience for a PhD. We've had people from physics as we're Biochemistry/Biophysics doing lab work for the 1st time ever. It's a lot about how much you want to do it, and if there would be enough time to pick up the skills to a sufficient level. I only know about some areas of Biology/Chemistry though.
I found that a lot of PhDs were going to undergrad project students, or Masters students that the lab knew. You could try seeing if there is a funding in a lab for a few weeks over Summer. I actually did 1 month unpaid, then the HoD paid £100 or a bit more per week for a few months then I eventually got a PhD in the department.

As I'm having 3 results chapters and following a set convention of lit review, M&M, results, conclusion it will have to be 6.

Well done

Do you have a skills section on your CV? I have one between my education and employment so the employer get to that first.
Good luck, I'm currently temping and trying to move into industry without any previous experience.

You should network with people in roles you would like and find out how they got there, write to potential employers on the off chance they have something. You might consider choosing another job in the type of company you want to you can apply internally.

Get careers advice on your CV, covering letters, how to sell yourself and wear a nice suit. I presume most people don't understand what I did. I stress the equivalent skills I have to experience. I'm now bringing out things like I did work in a shared office, work with other students, academics, do collaborations=teamwork. Teaching=management.
I say that I managed a consummables budget=ordered lab equipment, booked conferences. I answered phone/talked to suppliers/photocopied/greeted visitors. There's project management from working independently setting deadlines yourself, planning work. There's problem-solving, initiative.
As it is business-based surely all the generic office agencies should be able to find something good? How are your IT skills, do you understand finance? These 2 areas will be better paid. You could get on a graduate training scheme e.g. in finance/managemnt which could be £20k.

Someone in our lab gave up after a year. People have to upgrade to PhD from an MPhil usually anyway. I think it's probably better than struggling through with something you don't like and/giving up after 2-3 years. I decided I was nearer to finishing than starting and should finish. There can be disadvantages of a PhD if you change career completely, i.e. marketing your skills as non-academics can struggle to understand, lack of experience and initial low wages.
If you dropped out at the end that is when it would reflect badly on the department so it is in fact the best time at year 1.

Maybe try contacting some recruiters (the ones who want the PhD), and find people already working in the area.
Also where are the jobs? If in London or high living costs the salary may not mean as much. Would you enjoy the work? What if you changed your mind mid PhD, what are your options?

Have you looked on the newwave articles?
http://sciencecareers.sciencemag.org/career_development/
There are articles on whether to stay in academia or not, you could go on GRADschool this year or next and see their articles. I would say gather as much information as you can and make an informed decision.

My supervisor doesn't seem to care less in students, only papers/conferences/funding. It is personality. Academia can be quite harsh though in general and I decided to finish my PhD and leave. I've hated it for the majority of my PhD. I want to do medical writing now and I'm waiting for my supervisor to read my thesis so I can submit (waited 2 months).
Is it constructive criticism designed to help you? Sometimes it comes across as very harsh/is put across badly and is meant to help you however misguided.