OK, new game.
For those who don't know Doctor When, he dresses as a Victorian ALL the time and he lives in a water mill.
This insight into his personality may help in the following.
Doctor When went to a car boot sale last weekend to buy some shelves.
You have 20 questions which can only be answered with a 'yes' or a 'no', with which to guess.
What did Doctor When come home with?
Are you angry that it wasn't shelves?
No, he can furnish his water feature with whatever he likes.
But you are right, he didn't come home with shelves.
19 questions left
Can you wear it?
Ooh, that one's difficult. It's not clothing, but you do sort of wear it.
18 left
is it fake tan? 
No. 
17
Yeah but it would of been funny to see him with a false tan, OK I will get back to work and give someone else a stab. 
Yeah but it would of been funny to see him with a false tan
Bit difficult to see under that handlebar moustache. 
Is it a single item as opposed to a collection of things?
An item of adornment, jewelry sort of thingy?