Please provide a single documented example of any UK insurer invalidating someone’s car insurance solely due to a mis-spaced plate, better yet the ombudsman’s published judgement upholding the un-writing of the policy as it would be the talk of the motoring and likely mainstream press along with the perfect excuse for compo face.
In general terms, enforcement policy (rightly or wrongly) seemingly varies by force area, I can’t help but feel that it would be better if DVLA offered people the option to alter where the space appears and charged an administration fee for doing so, while police enforcement was standardised and the penalty system moved to tiered strike system for non compliance, say £250 first offence, £500 the second time and £1,000 for the third plus the plate being withdrawn and you having to pay to re-register the car and have it inspected prior to going back on the road. That would increase revenue, reduce offending and re-offending and result in repeat offenders actually being punished. Realistically £100 every 15 years isn’t going to strike fear into private plate owners, it’s just another cost of motoring.