Found out by reading some small print on a pamphlet whilst waiting for jab at GP surgery. Needless to say, being anaphalyctic with seafood, I mentioned to the nurse, who was unaware. Only contraindications they have been advised of is eggs.
After many phone calls between GP surgery and Swine Flu Medical Advisor helpline, they decided not to give me the jab and to also refuse to give to anyone else with serious seafood allergies.
I'm now on a list to receive the Celvapan.
So - a big warning flag to other seafood allergy sufferers!!