No engine start on my vauxhaul Corsa?

Flashing engine light usually means the immobiliser is active.
Have you dropped the ignition key, or had the key open for any reason? There is a small black/grey transponder chip inside the key, dimensions about 7mm x 3mm x 2mm.
Lost or displaced chip is the most common cause of immo problems on Vauxhalls, the rest of the system is pretty robust.
Do you have a spare key you could try?

vaux
January 2011