Help need cuttings for cherry tree

My dearest late father had a beautiful cherry tree which I would love to take cuttings from. I am new to this please can you advise from start to finish preferably step-by-step. We are based in the UK if that helps?
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Just look for sucker branches coming out of the base of the cherry tree (ie the rootstock) then graft onto that a branch from the top portion of the tree (ie the scion).
Allow them to fuse together. Then air-layer the sucker branch - sever from the main tree when there are sufficient roots.
If you start now, the new tree could be produced by October.