Which is the largest U.K. LEGO shop?
The LEGO Store in Leicester Square which opened in 2016 has an area of 914sq m 

(Source: Evening Standard, Telegraph)



The LEGOLAND Windsor Big Shop is 'one of the UK's largest shops for LEGO' according to their website. In 2015 the website stated the store was '... the UK's largest one-stop shop for LEGO'. It appears as if the Leicester Square store has taken over.



The LEGOLAND Big Shop is operated by the parks owner Merlin Entertainments. As it is not an 'official' LEGO store it does accept VIP cards or have a standard pick-a-brick wall.