I managed to snap mine off last night. Fun. I also need new hinges - not sure whether top or bottom but one of them is stuffed which is why the handle broke I guess.
Could be hard to get new hinges and you'll find that 2nd hand hinges will be munted as well. It's pretty easy to reco them, just remove the pins, drill them out to 8mm and put a bolt through with a nylock nut.
http://www.ebay.com/itm/JENSEN-HEALEY-LOTUS-TALBOT-SUNBEAM-HILLMAN-AVENGER-OUTER-DOOR-HANDLE-NOS-ORG-/350995412080?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item51b8f4f470 (http://www.ebay.com/itm/JENSEN-HEALEY-LOTUS-TALBOT-SUNBEAM-HILLMAN-AVENGER-OUTER-DOOR-HANDLE-NOS-ORG-/350995412080?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item51b8f4f470)