Evohome replace existing dial thermostat

I think I have settled on evohome over heat genius - the one question I have is, can I replace my existing dial thermostat with evohome and set just set my heating to continuous or do I need to replace the controller on the boiler?

I would happily replace the controller on the boiler, however it is a Stanley and also controls the oven...

System is oil powered BTW as no gas here - hot water is on separate system and not part of this project