I have a very good NHS dentist. He does rool canal work that doesn’t hurt at all, in fact it is quite relaxing and almost enjoyable.
My last root treatment and gold crown cost about £180.
My advice is to save your teeth at all costs. At 57, I’m getting to the stage where the next one to go may well mean the gap is too big to bridge, so I would have to have a denture. That would be a major disappointment, I think.
If you really can’t get into a NHS dentist, have your next holiday in Croatia and get the work done there. My brother in law did his that way (he had some really wierd stuff going on in his mouth – he had 2 sets of baby teeth and no adult ones) and he can advise on the best places to go/stay.