Hiya - and welcome...
If you want pay 'n' play, then Sibbertoft is good (but make sure you wash it all out afterwards as the residue acts as grinding paste on bearings, brakes etc!) but like Frank says, many of the lanes are like concrete...
Depending on where you are, there's two Northants meetings - the original Northants folks who meet on 3rd Thurs in the month and then a newish meet for those of us who live south of the county - Stoke Bruerne (The Boat Inn) on 1st Mon of the month - look out for SNOBs meets, which grandly stands for South Northants, Oxfordshire and Bucks...
All the best
Rob