Aga does not do any training courses for agas they keep all servicing in house if possible. They will do a training course for rayburns if you are in an area they are short of guild engineers covering it. However you want to note that currently I believe there are over 30 different rayburn models in production and they will send you to any of them if you hold gas or oil tickets or heatas as well, and they expect you to get it right as its their name on your van (Rayburn Guild) they also throw agas at you if they are to busy or more likely the aga is out of warranty. Youll be expected to be able to replace the top oven stat easily and that only involves lifting the top cover off, damage the enamelling and thats ÂŁ400-500 for a new top!! You need to be confident with vapourising burners as Aga will not certify any conversions put into rayburns or AGAs be they gas or oil. A poor burning vapourising burner can make a heck of a mess and a lot of CO. Agas are a bit of a pig to work on as the hot spots can be v heavy, so dont drop them on the nice black top cover, but apart from that they are great to work with. Only advice is never ever try to service an oil raburn nouvelle cooker/boiler, you wont achieve a happy outcome and youll be there all day and back for the rest of the week, so say the aga training techies. I havent had the pleasure of one yet, as I took their advice.