prawns

[cassis135]

i have just returned from tesco with 1lb of cooked prawns for dinner im making on saturday night....however ive just noticed the sticky label on the bag (they were from the fish counter not pre-packed) says use by 27th - tmrw. they also cant be frozen.
is it mad to consider still using them on sat night? i probably would normally but as im cooking for 3other people i dont want to be responsible for food poisoning!
i appreciate any help!