Your wiring seems to be slightly different from ours. Viewing from the rear, it is clear that the 2 terminals on the left are the relay contact output (controlling the oven), and the 2 on the right are the supply to the timer. There might be an internal connection between them, but I think this is unlikely (I haven't checked).
Ours is wired as follows:
Top left - Red - Live from high temperature cut-out + link to Top right.
Bottom left - Red - to oven control switch.
Top right - Pale Blue or Grey - Live to hob controls (for ignition).
Bottom right - Pale Blue or Grey - Neutral from oven control switch.
Ian Taylor
January 2009