Top speed in excess of 140mph

Any specific reason for this? Are you thinking of track days?

Yes and also German Autobahns

Thinking of getting electric car. Not sure if what I want exists or not.

Track days and Autobahns in a £40k electric car with a 300 mile range and 140+mph top speed?, er no, it doesn't exist.

An electric car with a 300 mile range is going to have a big battery, which is going to be very heavy. This, along with how doing a track day will affect the range (catastrophically), how all that weight is going to affect the tyres on a track day (catastrophically) means an EV, at the moment, is entirely unsuitable for a track day. A lap or two round a track?, fair enough, but a track day?, no.

And the Autobahn. Well, if you were to consider something like a Golf 1.5TSI (150bhp). At 70mph in average conditions, it will probably be doing around 50mpg. At its 140mph top speed, that figure is going to be 15mpg, possibly less, certainly no higher than 20. It has an 11 gallon fuel tank, so at that speed, it will be empty in 165 miles, rather than the 550 miles at 70mph, which is a 70% drop in range. Same applies to EV's, the drop in range travelling at 140mph rather than 70mph is going to be absolutely huge, and because of the charging time needed for the extra stop or stops, you won't save time by doing 140mph, you'll lose it, or to be more accurate, waste it.

This is the reason so many electric cars, sensibly, have a speed limiter.

You might want to check if you can charge an EV at home, i.e. your home has a driveway/garage capable of fitting said car (EVs like Teslas aren't exactly small) and your hom'es electrical supply is capable of accepting a home fast charger (not the same as the ones in car parks which are far more powerful).

If so, then add on the cost (minus any government grants) to your budget, as you'll likely need it for a car with a long range battery.

Yes got capability to have 32A in garage and size of garage would accommodate car up to 5m long.

Appreciate I would not get 100kWh charging at home but if left overnight on a 7kW charge that should be sufficient.

Blimey, that is surely taking a grudge to extremes?, you buy a new Ford 37 years ago which turns out to be rubbish (as many cars were at the time!), and that's it, no more Fords!.

Maybe so but since ditching the oval badge I have had some good Japanese and British cars.

Anyway going forward Ford Mustang e-mach and Tesla model 3 are on shortlist. Will be arranging test drives soon.

Any other suggestions ?