EDIT: I'd completely forgotten about this being here and more importantly, just how out of date the information was.
The eBay store is now something I'm trying to downplay over time in favour of my own store based on octoinkjet.co.uk which has a much larger range of parts, including tube fittings, refill tools, clips, auto-reset-chips, waste kits and more besides.
The advantage of this is that you don't have to pay the stupid costs that eBay insist on charging for small transactions. Net result is the eBay store is still open but only selling larger items like waste ink kits, printers (occasionally) and similar.
Main Store: http://www.octoinkjet.co.uk/
eBay Store: http://stores.ebay.co.uk/snailsource/
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Printers: (Canon) MP500/830, MX700, iP4000/4200/4300/4500/5200, iX4000(A3) (Epson) C84/86, D88, CX6600, R285/800/1900 (HP) K550, K850, K5400, L7680