David Tedman
Google
If you're interested in English history, or 1930s fashion & design then Eltham Palace in South London is great. A English Herritage site, booking tickets online in advance saves you money, but if course English Heritage members get in for free. Parking is available at £3, but limited (free for EH members). There is an excellent free audio guide focused on the house during the 1930s/40s, but it does not ignore the Royal Palace background. We were there around 2 hours, before having a hot drink in the cafe. Chose not to explore the grounds as it was freezing in early January, we did however sign up fir EH membership, got our entry fee refunded so we can come again & explore the grounds in warmer weather.