If you are over 50 and intend to apply for the non o retirement visa, it makes sense to apply for the visa before you come to Thailand for a couple of reasons.
1. It makes it much easier to open a bank account in Thailand.
2. You do not need to have an onward flight booked.
you were lucky, but as always this is Thailand so it varies between offices. When I did mine a couple of months ago, I booked and there were about 30 people waiting when I got there! Without an appointment I doubt you would have been seen that week!
If you believe the nonsense on the Internet you will think that all British people eat is beans and fried breakfasts!
You can get food from pretty much anywhere in the world in most places.
The food in the UK is good quality with excellent restaurants everywhere. Of course if someone wants trashy food they can find it, the same as the USA.