EDIT Just checked the manual, you need a 15mm compression elbow, a short length of tube (copper would be proper) and a new olive for the old elbow. And you don't need that white thing from the old shower
After a visit to the local diy merchant the job is now done and the shower working as expected. Thanks yo you all for your time and helpful guidance. @The Novice and @oldbutnotdead if that pair of speed fit flexible pipes is of any use to you then whoever pm's me their address first gets it in the post as a token of gratitude.
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