This may sound way off but could the wear on my key interfere with working my glow plugs ....I know this sounds strange but is it worth getting a new Kew cut 

Can't see the connection as the key is doing the job of immobilising the engine to start/turn over.
Check the coolant sensor is working within the parameters as it could be giving a false reading to the glow circuit

I know that a Ford Transit is not in the same class as a Honda but with my last transit I had all sorts of odd problems with the tick over, running and dash display had the igntiton barrel chamged (10 min job £25 incl part) had all problems gone!!!

But as I said it was a Ford and compared to a Honda - well you can't!!!