This, shockingly, is actually quite well paid considering for the UK.
Lead Data Scientist for the UK Government is currently advertising for a salary of £57,670 - £67,500.
https://www.civilservicejobs.service.gov.uk/csr/jobs.cgi?jco...
Government jobs are terribly paid. They tend to have good pensions worth another 15-20k though and tend to be very flexible.
Project manager on 65-85k
https://uk.indeed.com/m/viewjob?jk=a43416327745431e
Lead data scientist 100-110k
https://www.reed.co.uk/jobs/lead-data-scientist/56925078
Neither of those are London based.