Does the lease include the land behind the south stand across the road from the cricket club?
If redeveloping the existing stadium is too expensive could that land be used to build a new one?
AFC Wimbledon built the new Plough lane for £34 million.That's an entire enclosed stadium built in the middle of London. We could start by building stands on one side and one end with termporary buildings on the open side to house media and cameras. The existing offices, catering facilities in the south stand and car parking used on match day. You could even leave the stock car track in use.
Then add to the ground over time.