Please excuse the rambling nature of this post!

So I've come to the end of a 4 year comp chem iphd from a Russell group university. The last year of my PhD did not go at all to plan, many things went wrong with the project both in and outside of my control.

Funding ran out so I have found a reasonably well paid (at least for a starter) job as a data scientist at a well respected financial company, so far the job is going really well, I have much scope for promotion, I'm fitting in well and for the first time in years actually enjoying the work I'm doing.

My question is should I bother to write up my results for an Mphil? I have till September 2020 to submit and think it would realistically take me working most evenings and weekends until then to get a defendable thesis together.

I've completely given up hope for the PhD, my supervisor agrees with me that writing up what I have to this point would likely be passed as an Mphil. Given that I'm happy in my new job I'm struggling to find any motivation to write up my thesis.

Everyone I talk to tells me I'll regret it later if I don't do it but I'm not so sure, I already have an Mphys and have no intentions of returning to academia, I'm douting that having an Mphil over '3 years postgraduate research' on my cv is going to have a big impact on my future career.

Additional things to bare in mind:
-relationship with supervisor is still good, he hopes I can at least get the mphil

-I was very unhappy by the end of the PhD, hated the work and had little confidence in my ability

-my new job is enjoyable but demanding, I suspect serious work on the thesis would impact my day job now

-my head says I should try but my heart tells me to call it a day

Any advice would be appreciated!