FTR, a shockload inspection runs at about £6k if all is well (TO360). A new Top Prop for our commander (3 blade Hartzel) cost £7600 from Proptech in Portsmouth.
We eventually sent our engine for zero timing with Nicholson-Mclaren after some great advice from Ppruners
We would have gone with Barrett had we been on the N reg, but NMA offer many of the same services, we're getting the static and dynamic balancing done at the same time, and were cheaper after shipping was taken into account. The crankcase was badly fretted though and required sending to the USA anyway for machining by someone who has authorisation to do that type of work so perhaps had we known that before then we may have gone for BP in the first place.