Update 25/07/16 - due to over-enthusiastic gardeners, this cache's original GZ has been obliterated. The final location has been changed slightly and a new cache put out, so if you have already solved this one, there is a slight offset required.
Update 04/07/17 - the puzzle has had to change slightly but the final location has stayed the same.
Update 06/09/17 - coords have been checked again and slightly adjusted (S+0.003, E+0.002), please recalculate your solution!
MIN1 + OR2 - OR1 + 0.235
MIN2 + OR2 - OR1 + 0.049