I'm a satisfied owner of a 2010 Euro 5 compliant petrol Audi A5. It's been fully serviced from new, still runs completely fine and comfortably meets all my driving needs. I commute into the London ULEZ zone, but my car is compliant so that's fine.

For my next car I want to go electric, as it seems daft to buy into another petrol or diesel car now, but prices are still very high and frankly none of them appeal to me as a suitable replacement for my A5 coupe for a price I could pay, so I'd rather wait a few years for prices to fall and some more interesting models to come along.

However, I have a couple of more expensive maintenance jobs coming over the horrizon, e.g. the clutch probably needs doing soon. So my question is how long is my Euro 5 petrol engine likely to stay compliant with ULEZ and other similar legislation? In the past I would have assumed that any changes would be signalled years in advance, but the zone expansion happened very quickly so I'm not so sure now.

Realistically, what's the quickest that things might change and make my current car financially unworkable? Just trying to work out how much time I'm buying if I spend on my current car now as I'd hate to drop a couple of grand on it, only to find out I have to replace it a few months later.