One or two of our club members used Leighs antifouling last year and report very good results. They used TF400. I used International Micron and at the end of the season there was a fairly thick layer of green slimey weed on our boat and theirs came out clean( from the same mooring area).
Since then I have contacted Leighs and it turns out the TF400 is now superseded by TF500 and if you want their self polishing version this is TFSP500; both aren't cheap at £20.74/litre and 21.26/litre resp. but it works!