Qualcast Easi Trak 32 Lawnmower with Grass Box (West Drayton UB7)

I have an old Qualcast Easi Trak 32 Lawnmower with grass box together with manual leaflet. It was in working order until the push button box went (think that's what is is). Someone with the 'knowhow' can easily fix this by replacing the part which I believe is not expensive.
Needs to go ASAP or unfortunately will be going to the tip over the week-end.

Thanks for reading :)