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Ok fo3nix, I have been busy getting to the bottom of this, I understand what the different readings are now, there are a thousand k in a m.......doh, so obvious lol.
Anyway, they have been updating our lines and we are now definately on an 8mbps connection.
I have moved my airport so there are no electrical interferences, and re run the test, on average the reading is 6650, which working on my new found knowledge is 6.6 mbps, which is ok for me.
Funny thing is though the PC is running off a speedtouch modem and not the wireless router and only returns a reading of 3.5 mbps, not too bothered about that though, it's not mine lol
Thanks for all your help
Shiz