Hi, is there any 'pay per hour' accountancy services ie. need a 20 minute call to ask questions and pay a fee for that...without having to buy a years worth of services or the like?

Yes mate there are......your initial problem is that if your queries have to do with your earlier R&D claim and consolidation matters, there is a mountain of background to go through in order for someone to give you any advice......and if you are looking for an hourly rate for one-off advice in this specialised area, you are going to pay a premium for it.......unless the advice is from someone who is going to be your adviser over a long-term period....
regards
BC

Good Advice from Brendan.

There are also R & D consultants who will take a cut of your return instead of hourly.

Do a google search.

AJ