Thanks for the advice on the crow calls.
Someone posted a method to attract corvids, it mentioned getting a rabbit and splitting it open and then retreat to a hide. I could only manage a pigeon. WOW! does this work! The hide was really well made (obviously not by me) it was a very windy day today, five minutes after putting out the pigeon I had a magpie, then the rooks started to come in. It really worked well, I had tried this method last week and failed due to a **** hide. It really is worth a try..... stuff the crow calls!!
Maggot