1. yes
2. chances of being a lecturer after a PhD are about 5% in the UK I think. Takes 8-10 years in science
3. Postdoc, research, unemployed: yes. Lecturer, see above
4. You can get a job straight away after finishing PhD or it might take years
5. Postdoc salary in UK is about £25-33k, lecturer is £30-40k entry level