Best UK Safe Treatment For Whitespot(Ich) Please?

Pretty sure I have a cardinal tetra with whitespot on it   

Introduced a few gold neons a couple of days ago and it seems to have appeared since then so assuming they are culprits (although I never put the water from the shop in the tank so not sure how it has happened, they are so tiny I'm sure I would have noticed a massive whitespot on them!).

Anyway having read up about Ich I'm now wanting to go to the lfs and get some medication.  Have heard that Kordon Rid Ich is best as it has lower levels of  green malachite?, is this widely sold in UK does anyone know?  Or any other recommendations?

ASAP pretty please, would like to start sorting this today as I'm worrying about my fishies 

Many thanks (have also posted on emergency forum as wasn't sure which was best)