People seem to be forgetting that in the un-controlled environment, to get the CAA to come out and renew the ARC, you first need a sub-part G to make a recommendation to them to renew the ARC, thus you will need to pay the sub-part G to do a full review and then the CAA costs on top. This is verses just paying the sub-part G an annual fee to do the job anyway.
I don't think that's correct. For aeroplanes < 2730Kg, if a CAMO has recommended that the CAA renews or reissues the ARC, then the fee to the CAA is £25 per 500Kg MTOW. The CAMO has already done the Airworthiness Review, so you don't pay the CAA their £122/hour to do it.