....z:Hi,am using sky subscription on downstairs tv and sky freeview only upstairs sure i read somewhere you can change it to your local itv thanks in advance.I assume you don't have a viewing card for that box?
If you use a Sky box without a viewing card it defaults your BBC (101) to London and ITV (103) to Central.
So you have two choices, either manually tune your correct ITV region, then watch via 'other channels' as described in BBBs link.
Or buy a FSFS (Freesat From Sky) card @ £25, which will regionalise your box so you get the correct BBC/ITV regions on there 101-103 EPG slots plus give you access to the few extra FTV channels such as Five, Fiver, Fiver+1, Five US, Five US+1, LFC TV, Viva, Sky3 and C4 HD and Five HD (if you have an HD box)