I remembered reading this thread and while I was browsing for sunbeam parts and memorabilia I came across this http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&category=31252&item=4500327221&rd=1&ssPageName=WDVW

Might interest you guys sourcing IMP pistons, I don't know what sizes are required.

i used to run a imp pistoned 1220 in my 850 back on my P plates had a 12940 head 648 cam and a 42mm webber, what a motor went easly as good as my 1310 731 cam and the same carb

i still have the motor but i am missing a piston as one broke a ring land, i also have a bare block with all the machining done just no internals

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100% Pure A Series Turbo
Morris - The Original RedBull Racing

Those ones are too big for Mini use, only good for a sleeved Imp block.

Just heard back from JP Pistons- they currently have Imp pistons in stock, standard 68.0mm bore or oversizes, for $99 each + GST + freight.
http://www.jp.com.au/JPPistons.html

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.