Thanks for the info on here, but I still couldn't decide.
I had been looking for a sampler everywhere but most are only available in the US, eventually found this: http://www.keyboardco.com/product/cherry-mx-switch-sampler.asp
It's the Max Keyboard sampler.
I know the site doesn't look the best, but ordered on Monday and received Wednesday morning. They also supplied full tracking info.
It's a great website, the UK's only stockist of the Filcos IIRC. It's well known amongst keybaord heads so you shouldn't have anything to worry about.