In reply to yulquen:
You would be much better of with a length of static rope and a steel krab. 10m would allow you to setup a good section of the routes but even then a second rope to equalise is also useful. I carry 10m and 20m lengths for the belays which allows doubling up (e.g. on smaller trees if needed)
There are easier routes there, but you are right that High Rocks is better in the 5c and above range. Its £10 each for the entry - If that puts you off, Eridge is a great alternative and has a spread of easier routes instead.