Not much help I'm afraid but we were walking past it a couple of years ago and a mate wanted a look inside - door was unlocked and unoccupied - from what I can remember then it was perfectly ok and my mate said he would have been happy to stay there.
Totally agree about the location - I don't get out that much at the moment due to other commitments but that area is one of my favourite in Northumberland - will park half a mile further up the road at the stream at the bottom of 'The Street' and up to 'Wyndy Gyle' is a favourite walk.
Simon - you asked if energy/protein bars etc are a myth or not. There was a Panorama programme last year looking at the evidence about various sport products and whether they work or not - It is still available on the iplayer called 'The Truth About Sports Products' interesting programme.
Graeme Obree mentioned by Peter earlier on is on it a couple of times discussing his diet - including the jam sandwiches.
I'd experiment with various things and see what works for you and stick to it whether energy/protein bar or not. For me a few bananas do the job.
I don't have one of the lighter Jackets but I don't know if they will be less warm - no doubt I'll be corrected if I'm wrong.
The material that is lighter is the outer windproof layer and I doubt that will make much difference to the insulation as it is still windproof. I don't think a thicker outer layer woiuld be warmer as it is not trapping any more air to warm up.
I believe it should be just as waterproof as the pump liner is the same and the main purpose of the outer is to deflect (stop) water from penetrating through to the pump. As I say no personal experience of the lighter jackets though.
PGJ
