Hi Henny Penny
Was there during our August bank holiday weekend, Windsor that is. Kids and parents all loved it. Went for 2 days and both days were needed as there is a lot to do and some queueing to do on the popular rides( longest by far was 40 mins for big rollercoaster). Our kids are 7 and 4 and were able to go on all rides and rollercoasters. I would definitely reccommend it.
We flew to Bristol with Ryanair, rented car from Hertz. Bristol comes in on the road that leads to Windsor M4 , about a 2 hour drive.
Booked hotel (Novotel, Heathrow) through the Legoland website as it was the cheapest way. Perfect for a base with very good food on offer. Was able to use the Hotel Hoppa 2 days to go to Heathrow and use Tube to go into the city sights. The hotel was about 12 miles of motorway away from Legoland. I think having the car was a big advantage.
Parents knackered, kids wanting more but all absolutely delighted with their weekend away