I used to go as a child and now take my DD. Some of the things that are there now I rememeber from 25 years ago! It is great and DD (8) loves it. Think she was 5 or 6 when we went first. Plently for a 4yo to do.
not been to this one but to milton keynes, it was brilliant, had 18m old, 3 1/2 and 5 year old. only downside was on some of the rides it was maximum of 1 adult 1 child so they fought over who went first. dora and diego are at all gullivers parks now