Newhome Cooker Thermostat Problem?

We have a Stoves Newhome EF600 built-in oven/grill which appears to have developed a problem with the thermostat in that it no longer cuts out at the desired temperature.
Does anyone know if this is an easily sourced and replaced part or am I looking at a new oven?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.