I'm in Cranfield and would be willing to help but I have a fair bit to do around the house at the moment (just had a load of building work done and I have to finish the patio etc). Could probably spare a couple of hours but that is about it.
If you have a hoist (cheap enough to hire or buy) then changing an engine is a relitively easy, single-handed job which you should be able to complete in the course of a weekend.
Is it the labour you need or are you just a bit unsure of what to do?
