You've got A1 that's at the turn off for Grantham, it's about 40 minutes from you or Robin Hood near Blyth that's about 50 minutes from you. Both run outside on astro, I was at a place called Hop Up Racing last year it's run by a guy called Stewart Broughtoneley in North Kyme I think they are building a off road track at the moment might be worth a look.
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