planning permision

[cogsy]

hi at the back of our house there is a nature reserve and today the coucil put wooden stakes in the ground forming a large circle we ask what was happening and they said that they are securing a compond to build a play ground on the site we have never or our any other person on our street had notification to say that the park is to be built what can we do to prevent it as no body whants it there

[buildersmate]

I suggest you start by finding out which the departments at your local council is responsible for this 'park'. Although you describe it as a 'nature reserve', such open spaces are not typically aligned to areas that allocated for playing in (Recreation / Parks), so I suspect this is merely an open space, not a space allocated to promoite wildlife.
You entitled your post 'Planning Permission'. Whether planning consent is required really depends on the allocation of the space. If you talk to Development Control at the council (the PP people), they should be able to confirm what allocation this particular space has. If it is already a recreational space, PP is probably not required - nevertheless the department responsible for it must have had some internal discussion/decision-making process to decide to approve funding/expenditure for it - so you could try questioning what consultation process they went through.
I wonder what your concern about having such a use is?