Where Can I Get Proper Miticide in the UK???

Hi peeps i have a bit of spider mite issue from some clones i got off a m8. I swear the one thing u should never ever do when growing is cut corners to save time but any way... i have been trying to get some floramite or avid in the UK but the ony thing i can find is those neem oil solutions. I have tried all my usall hydro stores . I need some thing industrial which is gona stop these fuckers dead in there tracks. This is a large crop and i realy need to sort this out before it gets out of hand.
Any advice peeps??
Or just any one in the UK what products are u using to protect your crops?
cheers ziggy