the land on which the garage stands can be built on as it just needs a change of use for planning permission. I passed it a while ago and it is a mess so building would not affect the area. As for extended use of the park as long as the houses are built to fit in with the area the council would find it hard to block as this land and a few others around the area have had planning rights for a while. While it may not be right there is not much that can be done...... but I know a few locals who would love to move into their own house..... if only they could finance the move