I know what you mean about the RSPCA.
My experiences have been very mixed. . . . I've had two persians from independent rescue centres and two from the RSPCA. The two from the RSPCA came to us in a bit of a state - they had been in the centre for about a month, brought in by an inspector as strays. They were matted, underweight and filthy. The RSPCA neutered them and chipped them and gave them their first vaccination. We had to wait a bit as they wanted to keep an eye on one cat as she had sore ears and was on drops. They also told me that she suffered from an upset stomach (which later, we discovered, was as a result of huge and inoperable intestinal/bowel tumours and she was sadly put to sleep just over a year after we adopted her.
When we bought them home, they were so filthy and knotted that we have to bathe and groom them - the first time I have ever had to bath a cat, in 15 years of having persians!) The water was black with dirt! I took them straight to my vet for a check up and the first thing he said was; "these cats have ringworm!" Unfortunately, they had passed it on to our existing cat in the household, my daughter (then aged 4), my husband and myself. I had spent a lot of that year in hospital and so my immune system was a little suppressed and I ended up with really bad ringworm in my scalp - my hair fell out in small round patches to match the cats! I think it probably took 6 months and almost £1000 to sort that out and the constant boil washing of everything and cleaning and bathing three long haired cats twice a week was just awful.
Of course, as soon as I knew they had ringworm, I contacted my local RSPCA to tell them (so they could check the other cats at the shelter) but also to express my disappointment that they had not noticed at the time of rehoming - bearing in mind they knew we had a young child and another cat in the house. Their reply was; "Well, bring them back and we will rehome them." No way! These cats, despite their unwanted ringworm, were part of the family and therefore would not be going anywhere! I was not at all impressed with their attitude - although I hasten to add that it was the front-desk staff at that branch that I felt had an appalling attitude whereas I cannot fault the dedication of the cattery team and therefore would not hesitate to go back there - I just might insist on better vet-checks!
Although all of the above happened, I am now just about to adopt two more cats from a different RSPCA shelter so it has not put me off entirely. Interestingly, the Hastings shelter is RSPCA but receives no funding from the RSPCA - not quite sure I follow that!
Again, as for the 'no children' thing, this did not affect us when we got our two from the RSPCA when our daughter was 4 - they just observed how the cats reacted to her when she sat in the pen with them for an hour!!! And of course, having grown up knowing that the cats are the bosses of our house, she already knew how to behave around them.
Speak to Ron - and take it from there!
Keep us posted!