I can:
Be a letter - but only one
Be furniture - but only one
Be a place in a fruit - but only one
Be from the UK - but only one
Be after all the positive numbers - Except one
I am a five letter word. Who am I?
Hint/Clue:
It has six anagrams believe it or not
Hint/Clue (Last one)
The letter is also a roman numeral