There's a hamlet in Hertfordshire called "Cold Christmas Lane".
In Kent, there are some good ones: Bean, also Borstal (site of the original Borstal for young offenders). Other funny ones are Sittingbourne, Headcorn, and there's a station called Bat and Ball.
As for Wetwang, wasn't Countdown presenter Richard Whiteley mayor of Wetwang? He also went to boarding school in Giggleswick. There was a poem sent in which he once read out on Countdown:
We went to Yorkshire for a week, and Wetwang we passed through.
But where oh where was the local Mayor? There was no sign of you.
What a let-down, we were upset, no scone, no cup of tea.
Did you flush your chain and disappear, or were you up a tree?
We looked for you everywhere, in the woods and down the lane,
But the Mayor was nowhere to be seen, no rattle of your chain.
So next time we're in the area, we hope the parlour's open wide,
And you're stood there with open arms, saying "Welcome! Come inside."
Mind you, as child I thought Luton was a silly name, because of local posh-voiced train announcements: "The Thameslink service to LOOton will leave from platform 1". You could imagine the rounded robotic lips on the first syllable.