These Permaloo toilets are so new that they haven't yet been opened for use at the time of cache placement. While taking a photo and getting coordinates, at least 2 groups of people tried to open the doors. They face out onto Oxford and there is a low fence seperating the building from the park so you have to come onto the footpath to access the units. There are two blue doors facing outwards, the left door swings in a clockwise direction and the right hand door swings open in an anti clockwise direction. Both are wheelchair accessible. Hopefully it is possible to open the door while using a wheelchair without assistance. The wheel chair symbol on the left hand door has LH in the wheel part of the symbol. Maybe it means that it is easier for a left hand as the letters LH in the wheel part of the symbol. This probably denotes that it is easier for a left handed person to move from the wheelchair to the loo. Likewise the right hand door symbol has the letters RH in the wheel. Only the right hand toilet has a nappy changing table. I would assume that both units will have all the necessary facilities with the usual set up.
The park itself has playground equipment as well as seating, some sheltered spots, and a traditional cache.
Now, for the important part. From the given coordinates taken from the footpath outside the facilities, head off at a bearing of 258.883 degrees for a distance of 1617.560 metres.
If driving, the easiest approach is probably from the west. The southern approach is partially covered by tree prunnings and the eastern/northern approach is the steepest and not so good for car parking.