In reply to Longsufferingropeholder:
Thanks all.
For the benefit of the archives, we went there today. Couldn't raise anyone at the farm so gingerly approached the neighbours in the bungalow by the track. They told us to carry on and said they'd let the farm know. Hopefully didn't upset anyone. Nobody chased us off anyway.
The vegetation on the top outs has obviously been very well cut back quite recently, but most if not all of them could still be quite emotional without a rope or something in place. Very strongly recommend dropping a couple slings or some other dangly above the next route you intend to do.
There's a really good half day to be had there. Would recommend for anyone passing by. We left when the sun came round.