I really dont think my Router/Modem or ISP is the problem - I've had fantastic performance for several years, and my current one is a Billion Bipac like the new one mentioned above so I'd have no hesistation recommending the brand overall :)
Also all other online games (GT5, LBP etc.) as mentioned have no problems connecting, and the Internet Test from PS3 Network Settings is absolutely fine.
I'll be testing the changing of servers tonight as per blackwiggles original suggestion hopefully that fixes my issue with Wipeout ..