Helen, not sure what PAs are? - are they people that assist you at home? - If so, Beccaviola has them too but not sure if they change. She is a mod but hasn't been on for a while as she has been very poorly but if you PM her, she might be able to give you some tips.
I know some people recommend a few drops of rescue remedy in drinking water (others say it doesn't do anything)
Feliway plug-ins help some cats but not all - the cheapest place is VetUK online but If you link through one of the rescues on here, they get 5% commission
They are £14.62 at the moment with free P&P (My mum's vet wanted to charge her about £35.00
) - they are the cheapest for Cystaid & Cystease as well
I noticed they recommend to use a Feliway plugin in conjuction with cystease for stress.