don't ring dunsfold before you go there - just turn up as ask if one of their spanners can have a quick look as your having trouble - i'd be supprised if they dont fall over backwards trying to be helpfull
bet it's years since there've seen a female up there (dont let that put you off)
Good plan. PM me if you can't get it fixed. My Dad is an old skool proper mechanic and does all of one local LR dealers work for them. He works out of a barn nearby and doesn't charge dealer rates.