OK saw on the other thread you're witth Culverden - then I would get Michael David to do it, he's great, and my horses didn't need sedation whereas they have done in the past.
I'm not far from Sevenoaks, have used Doug and Simon Vieweg - Westrow Equine for years on my yard for years, very well qualified and lots of experience with a very nice manner with the horses. They will try hard to put your horse at ease - highly recommended.