Thanks to all that offered advice. In the end the data extension caused issues so I started cabling from the modem to the router and a couple of other rooms. Completed yesterday with external cat 5e as everything had to go out and round.
All completed and seems ok with gigabit working too. Really happy to be able to get the router in the right place and as an early christmas gift my eci line had g.inp enabled yesterday which resulted in an 8ms delay being removed, nice!
Cheers
(New id on mydsl of skyeci)