Really enjoyable, I advise booking the space shuttle pavilion ticket and also the concorde tour. We probably spent a total of 3 hours including an hour on the concorde tour and this is without the submarine closed for refurbishment and with only a passing interest in planes.
great experience, plan on taking breaks, its a lot of walking and time but worth it
We were not allowed to enter Space Shuttle Pavilion or Growler Submarine even though it was mentioned on the voucher info page. The staff was rude and unhelpful.