So Prof Chris Carter seems to be the brother of the Louis Carter who contacted me, and they both live in Shepperton at the same address. They do, however, have a different phone number, so that's OK.
I do like the idea of combining musical and medical instruments, though, and that he needs to order them in large quantities, and that he can then put on his concert in September.

You've got to hand it to them - it's a more original approach than asking you to bank vast sums of money left in dubious circumstances! At least this scam doesn't appeal to anyone's dishonest streak.