Replacing British Gas EMP 2 Programmer/timer

I have to repair my mums central heating.I believe the clock has failed as the diodes are not responding and neither CH nor DHW are responding,and the pump is not running.The boiler is a newish condensing heat only boiler with external valves sited near the DHW cylinder.Is it possible to buy a replacement which is compatible with the backplate which will plug in.I believe Drayton make a suitable product.

Can anyone suggest a good product?

http://www.heatingcontrolsonline.co.uk/siemens-landis-staefa-rwb29-programmer-p-43.html

file:///C:/Users/Steve/Downloads/D70-8%20LP_Boost_Compatibility%20(1).pdf

Virtually any Drayton will fit. They all use the same back plate.

Thank you to both for the options suggested-would a digital be more suitable than an analogue version?