This is only going to work if the summer is good. Another rainy one and people will wonder if they actually saved anything by staying here. I am all for supporting the UK but when the costs at our main holiday destinations rival the most expensive Riviera hotspots, and the service is bad, and the parking costs atrocious, then why bother.
Think back as to why people left in droves for the Costa's in the first place. It was for the sun, and the cheap booze was a second advantage. The cheap booze is still there, but not so cheap, but the sun sure is. If you ask kids whether they want 2 weeks of sun, sand and beach, or walking around a wet garden centre stuffing their faces, then possibly some will choose the garden centre. But they are the couch potatoes anyway.
Sorry, if the choice is a wet week in York, or a sunny week in Mallorca, then I am 'off to sunny Spain viva Espana' etc etc. Plus by the time I pay fuel costs to York and back, I have paid the charter air tickets.