if you do the assessment in a decent centre they will/should send you some good training notes befoore hand, do you intend to go for assessment only? if so you will prob need some notes to use, basically there are 5 questions to answer, and 5-6 appliances to check depending on the centre it will be flueless fire, combi's open flued appliance, you then need to confirm that the appliance is safe to leave on, so can you read the screen of an analyser? can you read MI? do you know which number is heigher and therefore whether it is safe or not?, thats about the strength of it, what area are you in? we charge £65 plus £45 cert fee (to bpec not us) plus the dreaded VAT, so it can seem a bit expensive as a one off but there isnt a lot any centre can do about you needing to do it as a one off, when taken with CCN1 and/or other appliances we usually chuck it in for free, cause we are a nice centre haha
just read you are doing this as initial, if you have CCN1 i dont understand why it isnt part of your CCN1 and appliances, or do you mean its the first time you have needed to take CPA1, if you are currently working in gas you have done CCN1 which includes combustion so you really only need to know how the analyser works, can you not practice at work before your assessment?
there are far more intense courses available which will give you a lot more experience and knowledge check out GES i dont know how much they charge but have heard their course is excellant but to be brutally honest not everyone needs or wants the intense course, they simply want to comply with the new reg saying they need to prove competance when working on certain appliances, i have assessed loads of guys who "need" to do CPA1 and simply want to pay their dosh and get the assessment done they have little interest in the deeper level, i'm sure someone will advice on the GES cost