It's a bit like pot luck though isn't it? I had one good dentist when I was under the NHS, when I was a child my teeth with coated with something as I had weak enamel (lovely genetics!). This one good dentist did an xray of my teeth years later (after going for regular check ups every six months and being told everything was fine) and she found that actually it wasn't. I had to have loads of fillings because the coating had masked things.
That one dentist is now working privately though, she left and the good care left with her. Funny enough she moved to where my DH used to get his teeth done at a private place, small world huh?
It's a shame it's so expensive Bears, luckily we have our dental plan included so if we need anything really expensive it will be covered as well as a certain yearly allocation for checkups, xrays and the like. I hope you get the second guy from now on!
Totally agree that antibiotics should be given, that makes sense because like bears said how are you meant to know otherwise?
Waiting for a new cleaner to arrive, my good cleaner left for a new job 
and I'm not feeling too well this morning. I think I'm low on iron as I look like a ghost. Me and DH are off to go look at a house later today, I'm meeting him at the nearest tube station so it's going to be like a little adventure for me. I take so long to waddle around these days.