Old Dalby test track - advice please

[ianrail]

I wasn't sure whether to put this in the Light Rail/Metro forum because my enquiry concerns testing of new London Underground stock on the Old Dalby test track. I'd been told that some new LU stock was being tested there on Mondays and Tuesdays a week or two ago but that was all the information I had. Next week or the week after I'll be going past that area and wondered if it was worth making a diversion and hanging around to see if the stock was still being tested - and try to get some photos if the weather is reasonable. Do any members know any more details please?