Also watch out for the clever people who try to make a pirate "live" sleeve look bona fida, by putting a real EMI 7" from the red sleeve into the bootleg sleeve. It gets even harder to spot the deception then.
I saw the 7" and the 12" on record fairs and remember a price about 125 Pounds.
But usually you get them on Ebay for a lower price. Something between 50 Pounds and 100 Pounds. It depends on the circumstances of the members image, the pictures and the time of the offer.