Cast iron water pipe > compression fittings?

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I have a 1" cast iron water pipe supplying an old high level cistern. I want to chop it off low down and couple it to 15mm copper pipe to supply a new modern toilet. I know "cast" is joined with threaded fittings, so would it be possible to join like this? :/

thanks in advance
 
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If it`s 1 inch OD. it`ll be 3/4 galvanised iron ( not cast ;) ) so you`ll need a 3/4 adapter , as Buck said
 
Does that mean I can cut the steel or do I have to join in at nearest threaded steel joint available that will undo?
 
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As the replies state, nearest threaded joint. If you cut the steel, you won't be able to join it to the copper.
 
No it won't.

3/4 Galv is internally 3/4 with an outside dia of 1.05 inch.

22mm compression fits 22mm copper which is measured od.
 

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