RFT x 3 Dippping toe, a bit vague

I recently swapped the 18" rear RFTs on my Z4 Coupe after a nail in one rendered it useless.
I am now wondering whether to go the whole hog and switch the fronts to non RFTs too.
What is the value of 3 part worns? 1 is a Michelin and two are Bridgestones. I think there is 5-6mm tread (how do I measure properly?).

I am in Penarth near Cardiff.

EDIT: Asking price £9999 ono as I have to have an asking price as per forum rules but I genuinely don't know what they are worth. Anyone want to make a sensible offer?
 
Adds must include a price please as per Forum rules :)

Would certaily change all to non-RFTs never been in favour of mixed tyre set ups
 
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