I’m thinking of going to the British GP for the Saturday only. Does anyone know what the schedule is and the support races? Any advice about the best seating locations?

Pretty much anywhere seating wise is good at Silverstone. Prices might be a bit steep or in short supply seeing as it's only six weeks away.

Silverstone is one of the few grand prix circuits that gives so much trackside access even on a general admission ticket. So you will have a good time regardless of how much you're willing to fork out. If you don't get a grandstand ticket, head to Maggots corner (especially for qualifying). The cars are pushed to the absolute limit there. Great to watch.

The main support race on the Saturday will be the GP2 feature race straight after qualifying. Other than that I haven't a clue.

Just received my tickets for the British Grand Prix this morning. Even timetable is as follows:

Friday 04 July

10.00 - 11.30 F1 FP1
12.00 - 12.30 GP2 FP
14.00 - 15.30 F1 FP2
16.00 - 16.30 GP2 Qualifying
17.00 - 17.45 Porsche Supercup FP

Saturday 05 July

10.00 - 11.00 F1 FP3
11.30 - 12.15 Porsche Supercup Qualifying
13.00 - 14.00 F1 Qualifying
15.00 - 16.15 GP2 Feature Race

Sunday 06 July

09.00 - 09.45 GP2 Sprint Race
10.25 - 11.00 Porsche Supercup Race
13.00 F1 Race

Another race has been added.
Pre 1966 Saloon Car Race.
Practice Sat.
12 Lap race after GP Sunday.
Galaxies, Cortina, Anglia, Mini's etc. Yum,yum!

Now also Formula BMW - Full timetable here http://www.brdc.co.uk/news.cfm/title/BRITI...8/flag/2/id/683