Sorry for the delay in replying.
I am grateful to all that replied.
Today I did a little testing as advised.
The Router web interface is showing a download of 12.88Mbps
My PC which is CAT 5 via powerlines is 10.30Mbps ( powerlines )
My PC using an old wireless card was a disaster at 1Mbps ( wireless )
My new laptop sat by the PC is 11.30Mbps ( wireless )
My new laptop sat right next to the router is 11.80Mbps ( wireless )
My new laptop hard wired to the router is 11.80Mbps ( CAT 5 )
So to sum up , the powerlines to my PC are not causing too much to worry about , and I wont be switching to the laptop as I prefer my PC.
I guess I could fiddle with the wireless card in my pc , but its not something I'm very good at.
Many thanks and as ever , will welcome all thoughts and ideas.