Thanks for all the replies, already done the cowl as I had to take it off to remove the radiator for repair.
The existing bulkhead tape is held in place with copper tacks but the replacement has come with stainless panel pins. I have seen one car with small stainless screws which I thought might rub the bonnet but which seemed OK and looked tidy, so I'm still not sure how I will secure mine.
Thanks again
Malcolm