In reply to pennyhale:
That's right. There isn't. It reflects the strong history of adventure and trad in the South West and the local policies, supported by the BMC, and built up over 30 years about where bolts are and are not acceptable. It also reflects the lack of crags where low grade sport routes could be created/unearthed and worth it.
Bolts are not acceptable on Dartmoor (granite).
The only place for low grade sport in the region is Portland which is like Marmite (some love it, some hate it) and is a long day trip from Okey.
Drive to Bonehill on the Moors, chill out and have a picnic with the family and do lots of bouldering in between armed with the guide on the Javu website.