3-generational Christmas day trip Thames Valley/London

[maymummy22]

Hi,
I'm looking for ideas for a day out the weekend before Christmas - me and DH, 2 DDs (8 and 5) plus my dad and aunt (70s). We live near Windsor so anywhere within 45 minutes of so would be fine, or even London.
Any ideas please?
Thanks!

You could try our MN Local site for Westminster & City, which has thousands of listings including a Christmas What's On guide, attractions, restaurants... in central London: local.mumsnet.com/westminster-and-city