I've never tried the Jemma Kid skunk brush but I have tried the GOSH PROFESSIONAL one. Its a little bigger than the 187 and a lot less firm BUT EXTREMELY SOFT
But if you're wanting an alright alternative to the 187 you can pick it up in superdrug for about £11 me thinks. I've had mine for a little while and it does ok. It's good with blush and powder. Foundation...hmmm....subject to personal opinion.
Sheds like whoa when you wash it the first couple of times but it soon settles down (if ever there were such a thing!)
HTH!