A plug for Pro Swimwear* as their website indicates thirteen brands available and which has acted as a sort of speedo wikipedia for me:
http://www.proswimwear.co.uk (and I rather like the black Arena City - and maybe a good sign also that plenty of jammers are there to be moved in the January sale)
*rather appropriately from Bridgwater as that's precisely what's been flooding them since Christmas in Somerset with too much rain