Much as I would hate to see Broadfield House close, do we know how many people attend over the course of a year, and how many of these are not local - ie how much does BH really bring to the local economy? Whenever I have dropped in when passing it has been deserted - the only numbers have been for special events.
Having dealt with local government finance as my last job, I doubt that somewhere such as BH is going to be seen as high priority for expenditure compared to schools, education, social services and child protection......etc. Councils and councillors can get some quite bad press when children are beaten to death because the LA decided to spend money on other services - they may have that at the back of their minds when making decisions on the future of BH.
What we need is a philanthropist who likes glass with at least £5 million going free to buy the place and keep it running - if that is the best solution. Maybe developing the Red Cone site would be better?