Thank you for your reply it is much appreciated. I have noted all your points and I shall follow your adviceIf you really want to learn something from this experience, it's that ultra-low profile tyres are not the best for protection against this kind of failure (rare as they are) when driving on potholed UK roads. The stretched look is also quite trendy at the moment and probably not doing the tyre any favours. For these reasons and my automotive engineering background I keep well away from the bling wheel options (applies to all manufacturers, not just Tesla).
Practical solution now you've been bitten:-
1. Swap your wheels for standard Tesla 18" with correctly sized brand new premium tyres. Michelin would be my personal choice, but any premium tyre will be fine. Don't trust used tyres if you buy a used set of wheels/tyres as you don't know their history.
2. Check your tyre sidewalls regularly for damage (kerbs, potholes, debris etc can inflict sidewall cuts that can potentially lead to catastrophic failure)
3. Be very careful not to kerb your tyres when parking.
Follow the above advice and you are very unlikely to have any future issues. If you decide to stick with the ultra-low profile wheels/tyres you are still unlikely to experience another blowout, but damaged rims and flats are far more common with that combination. Whenever I look at other Teslas kerb damage is often quite obvious. People tend to think of rim damage in this case, but the tyre sidewalls can also be critically damaged. This would be in my top 3 guesses as to what led to your failure.
Thank you once again as I do appreciate it