My Master brake cylinder shat itself... which isnt very helpful!
It is a 78 model Leyland so its one of those dual systems (or something like that) not the standard leyland cylinder anyway.

Does anyone know where i can get my hands on one or any idea where i can get a decent rebuild kit for it?

just ring kar kraft and order a rebuild kit for it

Or a reputable brake shop should be able to do a complete overhaul and rebuild for about $200. includes a stainless steel sleeve and the body is cleaned and replated.
I have had a few done at Brookvale Brake and Clutch.

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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)
2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S

You may also need the proportioning valve to be overhauled as well.

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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)
2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S

The clubby tandem cylinders are no longer available to buy, but you can get rebuild kits for them:

http://www.minis.com.au/minis/catalog/p ... ts_id=1049

Alternately, you can buy the newer MCs - the same type they had in rovers. But these are a split bore, and you will also need to swap the lines to the proportioning valve.

I'd suggest getting your current one rebuilt and sleeved (but I'm far from an expert). A stainless steel bore will be better than any you buy new, and you know that it hasn't been sitting on a shelf for 20 years with ruined seals.

You can get a reco swap, too:

http://www.minis.com.au/minis/catalog/p ... cts_id=685

As others have suggested, have yours overhauled, don't buy new.

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The K-7800 repair kit is a PBR, should be available from any decent brake shop.

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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.