@Antonia ********

That is correct. I was just clarifying a (confusing) post

If in Thailand the money will need to be in a Thai bank account but needn't be in baht

The Australia embassy or local consulate can do the income letter

Your post is confused. You can use home bank only for first application out of country. You can use income instead or in conjunction with savings with a proof of income from your home embassy if not applying in your home country

Not correct....you can convert TR to retirement extension in-country

There is shuttle service from town

Correct, but the OP mentioned settlement and fiancee visa would be the appropriate option if not planning to return to Thailand

You can apply for a fiancee visa which permits your partner to travel to the UK for the purposes of marriage. If she comes on a visitor (tourist) visa, you won't be able to get married as most places are required by law to check as to visa validity

I used my Thai DL as proof of residence to get ETD from British Embassy even though I was only on a tourist visa, and went to Cambodia before returning to Thailand to get new passport. I needed to transfer the remaining validity of my Thai visa into my ETD before leaving Thailand. I had no problems leaving or re-entering and my new passport was back within 3 weeks

When I did my extension last year, I turned up at 6am, and finished mid-afternoon. The people turning up after 8am when they started handing out tickets (I think about 18) were being told to come back the next day, as they were no longer issuing tickets for that day, so maybe you've been lucky so far