Tony
I'm just up the road from you in Ashford.
I keep an eye on ebay as just occasionally there's a really good deal going. A while ago, I bought about twenty tubes of Bald Guyz moisture gel at rock bottom price (worked out at less than £2 each, including p&p). I've also bought Headslick and Headlube on ebay at about £7.50 a pop which isn't too bad. You just need to keep an eye on it and dive in when there's a really good deal going.
I also have a friend who goes over to the USA every year or so who can usually be persuaded to bring a few bits back for me.
With regard to blades, I use Gillette Contour Plus in the Headblade Sport which are great and quite cheap at Super Drug or Tesco/Sainsbury's. I've looked at "The Perfect Shave" and "Mankind" but they're sooooo expensive!
Cheers
Neil