I went through a red light in the UK when on a holiday what will happenWatch
- Political Ambassador
If you had insurance for this UK resident's car (and a valid driving license) you may or may not get a fine. If you were not insured, then it's more complicated.
If you were driving without insurance, you would normally get a bigger fine (triple digits) and points on any UK license you have.
If the UK resident who owned the car knew that you were driving without insurance, they can also get a fine and points. If they didn't know that you were driving their car, then you could be arrested for TWOC.