1-Your PPL never expires
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UK PPLs expire
A good school in a clear weather area as far as I know is in Florida...Depending on the pricing (wet or dry), some well known schools like American Flyers, ATP flight school, Delta Aviation Academy...from the top of my head,these school should meet what you're looking for...hope that helps
Those are pilot factories, not mom and pop shops.
I agree with Chandler Air Service.