A new timer is about fifty quid.
https://www.partmaster.co.uk/cooker-oven/cmce96k-7757486353/timer/product.pl?pid=2394553&shop=leisure&path=297856&refine=timer&model_ref=2506300
There will be two wires to link together. Ask someone ***COMPETENT*** to look at the timer and tell you which ones.
Gdhejdhd
February 2018