Ended up being a faulty hydraulic valve lifter.
Quite a job though by the end - cambelt & new pump belt kit. Camchain & tensioner kit.
And that TDV6 can be intimidating to work on the first time.
Message Thread 
Discovery TDV6 2720cc 2008 - Tapping noise from left hand bank - Fixed # - Nick Favell August 25, 2016, 8:59 am
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