No issues in UK, of course if it's income or capital gains then you need to take account of that. No issues in Thailand as it's just a cash transfer.
Interest rates on deposits are much higher in UK than Thailand if you plan to leave in a bank account
I'm not so sure, there's a gap in the market for a shared premium that doesn't go up with age, which incentives people to get health insurance from a young age, pointless being priced out when you need it the most
Don't forget @simon43 claim denied for April Intl (France), he contested that decision with the Consumer Protection body, i know you said previously he didn't declare everything he should have
The question is will Jomtien Immigration accept, i assume so, wait and see for any issues.
Good news is you can obtain in UK, someone brings to Thailand and should still be ok to use
You can mitigate the risks
Don't drink and drive
Wear a helmet
Don't ride after dark
Get a licence and experience back home first
Ensure you have control of yourself i.e. don't let ego and testosterone take over
Many need to self insure anyway due to the pre-existing conditions excluded in their flakey insurance.
Another thing annoying with insurance is they will exclude pre-existing conditions but won't reduce the premium to compensate