There's an indoor offroad clay track in beicester (10 miles)- racing on Wednesday Nights- 7pm to 11pm. They run 1/10 2wd and 4wd + SC10 when enough turn up.
http://www.prolinedirtarena.co.uk/
And there's a 1/10 TC club indoors on Carped in Milton Keynes (Wolverton- 15-20 miles) and they race Touring Cars (13.5 Li-Po), 1/12, WGT and Tamiya Minis.
http://www.mkrctc.org.uk/cms2/
They're the only local ones I know. HTH