Thanks for all the suggestions regarding a non-functioning clock. After removing it I found it was completely dead. I decided to replace it. However, I didn't want it to look odd so here's what I did.
First I got a battery clock movement from Maplins for £5.99. I bought a set of clock hands also. I then dismantled the Triumph clock and removed the hands and the clock face.
The centre hole in the face was enlarged so it would fit over the new spindle. It was fixed in place using sticky foam pads
Next the battery holder was cut away from the clock movement leaving the terminals exposed. A wire was soldered onto each of these terminals .
The new clock hands were cut and filed to suit and painted white, but I left the second hand red just to be different. The complete assembly was then fitted behind the instrument fascia with little strips of adhesive pad. The panel could then be refitted. There was just room to squeeze it in.
The wires were then led behind and under the dash where they were soldered to a simple battery holder also from Maplins . This could then be tucked out of sight behind the panel where the knee - pad sits. The clock was set before hand and the battery connected at the right moment. I can only adjust the clock in spring and autumn via the battery.
I'm very pleased with this little job and I hope you like the pics and the idea.