Today I gave the improved plan to Gerry, and got some valuable suggestion as follow.
I have had a look at your concept plan and it seems better. Just a couple of points;
I think the petting zoo is a bit tricky in an open park without protection. I know that this is only a theoretical park but I think you should consider the reality of the park. The animals would have to be protected.
I think you should mention for the DIY area that the park should have rangers or other staff to supervise the letting out of the items. You should mention that the park once had rangers and that you want to reintroduce this element. You should think imaginatively about how they would work in the park and that a source of funding would be required.
Remember in the garden area that there is very wet parts, so think of appropriate plants.
Mention that there was a quarry in the north east of the park and that there would be potential that this could emerge again as a place for children and adults to enjoy, with interpretation etc. You should be aware that the local community have asked for a Multi Use Games Area and this is planned in the sports zone. However I’m not sure how this answers your brief for an area that is both for parents and children as these areas are usually for children on their own. It would be interesting to see how you think these areas will look.