Walked past the site yesterday and wondered where we were with this. Thanks :)
You can just wander in - I did last night, the rest of the site is still a car park. There are some strips of new tarmac and a tent in one corner covering a hole. Couple of OB trucks yesterday too. Security chap on the way out (New St) might stop you going but walk in from Grey Friars & its easy. Apparently.