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You can save some serious cash by downloading money off vouchers from the Days Out website. Attractions such as Blackpool Pleasure Beach, Snowdon Mountain Railway and the New Forest wildlife Park are included. You can search the Days Out site by postcode, region or type of attraction.
It does costs £5 to get five discount vouchers or £10 for an unlimited number of vouchers. So do check that this initial outlay will be recouped. I'd think if you visit at least a couple of attractions with a family of four you'd benefit. However the savings do vary between attractions.