At the risk of being shouted at again, the Social Centre are the people who grant leases on the land. However, I think you will find that Haven are in a similar situation to Workington Reds. In both cases the clubs only had / have a short time to run on their leases and again in both cases the local councils want to do something else with the land and therefore the clubs cannot get the length of lease they require to obtain grants, etc.
In Haven's case the local council are wanting to make a compulsory purchase order on all the land at the Rec in order to build a new stadium, roads, etc, and therefore I imagine the Social Welfare Centre won't or can't issue another lengthy lease in case it costs them in the long run. The Reds lease on Borough Park ran out and because the council wanted to build a new stadium at Workington they would only allow the Reds to have a short term lease with conditions attached re. cancelling the lease when the time came to build the new stadium.