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What do I do with the unattached, open end of the LeakyPipe?
    The ends do need sealing.  You can either fold the end of the lateral over on itself and retain the fold with a cable tie or short sleeve section of 20mm supply pipe polytube.  However, it is tidier and more reliable to use a 12mm end plug.  (See 'end plug - 12mm size',  and fittings video)

You can also avoid needing end plugs by tee-ing the free end back into the supply pipe - this will only be a suitable solution where the layout of the supply pipe allows this connection e.g. when the supply pipe forms a 'ring' around the garden.