>Don't know how appropriate to post about Acambis on a Biotech board with talk of vaccines a while back thought it may be OK.<
Absolutely on-topic.
>The London shares are taking a huge hit today (about 40%). It was widely believed they would get some of the contract 0 is a shock.<
Selling to government under discrete contracts is a tough way for a drug company to make money. I generally avoid companies that rely heavily on such government sales for their business to work (e.g. HEPH).