Can anyone tell me if my GAP Tool should diagnose the glow plugs , I have been through the menu with no result .
My theory being that if it does , it might be worth getting a licence for the Freelander to prove a theory it letting me down on severely cold mornings and not starting. The trouble is that on the Freelander its not that simple to get at the glow plugs to test manually.

Apparently if the glow plugs are wired after a relay the ecu cannot detect it so , no diagnostic info.

Have to be VERY cold for it to be a glow plug issue. I am running on only three (believed) working (others unplugged) and started fine at -10 C - FFRR... .
Experience is the only genuine knowledge, but as time passes, I have forgotten more than I can remember
Volvo V70 P2 2006 2.4 Petrol 170bhp Estate SE
MG Midget Mk1 1962

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You were lucky , not had time to discover how many plugs are working or not, but -5c all night and all day till 12pm next day and -2c , it took all that time to try and catch the engine to life and a very stuttered start, certainly more than on glow plug not working .