Right battery been disconnected since 5pm voltage gone down to 12.23v..does that mean charger wasn't telling porkies

No it means the batteries knackered i would think. Shunt test it to check for a failed cell.
 
His wammers which temp sender is it for the glow plugs 2.5td 1996 ask this because flat battery all started with having to turn key 4/5 times to get it to start.

How long is the glow lamp on for? ECU switches glows on subject to temp reading from ECU temp sender. They vary in time subject to engine temp. Maybe you have a couple of duff glow plugs.
 
Right put battery back on charge last night so in total it had 56+hrs The battery has now settled at 13.2v so think the new charger reading is fubar. The battery was just slowly bubblin when it was on charge.
 
Hi wammers glow light only on for 3 to 4 seconds at a time. Glow plug changed June last year for bosch ones.
 

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