We used to store our caravan at Grange and I fully agree with VIP2006, that it's an excellent base to explore the NE with easy access to the major routes through the area. We've never stayed on the site due to living in Durham.
If travelling from the south, as you exit the A1 motorway turn left on to the A690 dual carriageway towards Durham. If traffic is heavy, immediately go across to the outside lane as you leave the roundabout, as the site is only a hundred yards or so through a right filter and crossover in the middle of the road. If you do overshoot, leave the A690 at the next offslip and turn right at the end of the sliproad. This will put you back on the road to the site.
The "Angel" is only 15/20 minutes north on the A1 and Hadrian's Wall about an hour (depending on the traffic volume passing the Metrocentre)
I'm happy for the mods to pass my email if you want more detailed info,
Ken.