the main area is but country walks might prove a bit difficult.
Yes I would call it wheelchair accessible. Their are ramps and the outdoor areas are mostly paved etc, there are disabled parking spaces right at the entrance too. If it's busy they open an overflow car park don't be guided in there, let the parking attendants know you are a wheelchair user
It's is a country park so dependant on wheel chair access will be mixed main areas are ok. .Though I would contact park directly as they are obliged to make the park as accessible as possible to all
They have access to suitable battery powered chair
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The top part where the playpark and cafe is but the nature trail along the river would not be I would think
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