I've just done a fair bit of heat protecting under the bonnet as I've just changed my exhaust manifold

Heat wrapped the manifold

Heat protective matting on underside of bonnet

https://www.ebay.co.uk/itm/151890400023

Heat protective sleeving

https://www.ebay.co.uk/itm/302012118280

Still need to reroute the bonnet release cable, but for now it's wrapped with the sleeving stuff