Oh nasty, sorry to see that, hope you get it sorted soon. A few months ago I bought a Mk3 Cortina, and on my way back down the M5, I noticed the bonnet had started to dance a little, so I pulled over and looked at it, and not before time! The spring catch that is screwed to the bonnet and engages on the top of the radiator support panel had come loose, and was still attached to the radiator panel, but not the bonnet. It was only a matter of time before it had caught enough air and I would have had the same predicament as you have. Reading the comments on here, it seems to be all too common an occurrence.