1100 may be to fast,and as someone mentioned thats most likely the cause of the run on. Get the idle down,too much fuel is being inducted, anti syphon valve will help reduce run on but get the idle down as much as possible in the first instance.

spent more time on it today got it idling at 900 shuts off better but not as it should

I just use unleaded not premium and no additives seams ot be ok

The accuspark shouldnt be too far away (uk) ebay

Tried to buy some spark plugs not much luck from supercrap didn't have any will source other suppliers even though it seems to run better

Thank You for all of your support and help

regards Norris

NGK AP6FS plug is one step colder than an NGK AP5FS, but for a fairly standard (by the sounds of it) HC pinto,the AP5FS should be better suited really.
Like others have said, high idle speed's probably the main cause & 98RON is always a good idea, particularly in engines that used to run on leaded fuel.
Cheers, Jason.

Thanks Jason i will also check the carby that the butterflies aren't slightly open at the moment its idling at 900rpm's