I used all Lucas switches Trevor. Some from Warwick at the time but others I bought myself. I did see these:
http://stores.ebay.com.au/Classic-Bi...i.html?_fsub=8
Snake bite has them:
http://www.snakebite.com.au/electric...sort=4a&page=1
All not cheap probably but I got the remainder of mine from Abingdon Motors in Fairfield/Dutton park Brisbane. They have been MG suppliers for 40 years and have all that stuff. Heritage MG in Melbourne have lots too and they are not that costly:
http://www.mgspareparts.com.au/
Cheers,