A group of friends (4 families with young children) want to do a long weekend away in early summer. 2 of the families have or will have tents and some equipment but the other half need some sort of accommodation and equipment available from the site, bell tent, yurt, pod etc.
One family in particular (me!) needs decent shower/toilet block 
Ideally a central UK location as travelling from Yorkshire and South London.
Does anyone have any suggestions or recommendations ?
TIA