You can visit Kew with delight at any time of the year (and you can visit at a bargain right now, as entry is only £9.50 until the end of January 2015). If you get a bright day, grab a bench and rest a while before you wander the grounds.
Then rest some more.
If you’re there in winter and it all gets a bit too chilly, you can hide away in a glass house till the blood flows again! And if orchids are your thing make a note to visit on or after 7 February this year, as that’s the opening day of the annual, stunning Orchid Festival.