Can anyone tell me if this is any good? Planning a birthday day out for Lego obsessed 6yo - we've been to Windsor a couple of times which he adored and I just don't know if the Discovery Centre might be a let down in comparison? It seems to have mixed reviews! Was thinking of buying the combo ticket with Sea Life Centre and doing the morning at Lego Discovery and then going to the Sea Life Centre after lunch - is that too much? Is it better to spend a full day at each? Will it just be a nightmare on a December weekend and really busy? We struggle to find days out for his birthday as he's a Christmas baby so theme parks close down over winter and outdoor things are ruled out a lot of the time!