Blame BT ~ They took it over from the General Post Office when the two split in the early 70s and have allowed it to rot away ever since. From time to time they have let out odd buildings but no maintenance has been carried out of the wooden huts for 30 years at least. Last time I went round the site (my company used to guard part of it) was some twenty years ago now and many of the original huts were falling down then and had H&S barriers around them.