A newish company mailed me their price list today, quoting annual incl all routine parts at £2.2k. Their prices look a bit higher than the current maint costs I pay and I'm not planning on swapping as I've found an operation that I trust, is well run and very efficient (and very busy, which is a good thing).
I guess yr prob will always be that you live on the tip of an peninsular at the far end of the country, and so geography is against you.
Its all the 'extras' that add up - ADs SBs Consumables Inflating the floats ...
Find a place (or a chief engineer) you trust and then trade with them.
h-r