For an R22, range £230 - £190/ hr with reductions down to £180/ 165 if paying for a lot up front (like 40+hrs).
It may be possible to negotiate a lower rate by buying a block of hours from a private owner and paying for the instructor at the RF/ FTO, but I guess the 'best' (cheapest) will be £170/hr
All PLUS VAT, of course.
h-r
NB base rate for a 300 about £230 - £260 + VAT.