You’d get about £250 scrap for it and it would be uplifted from your premises. My SinL has just done that with his 10 year old Vauxhall, where repairs would have cost more than the car’s worth. It had failed its MOT, so wasn’t driveable, or allowed on the public highway,
Unless you’ve got a sort-after car, I can’t see many people wanting a 15 year old car that needs welding work to get it through an MOT. Have you any idea how serious that work is and at what cost? Were you to have the work done and the vehicle MOT’d at the earliest date possible, you could just sell via webuyanycar or similar.
You’ve also got the hassle of advertising, possible test drives (go with them) plus potential tyre-kickers who could offer you a silly price and all the time funding tax and insurance on 2 vehicles?
Sorry, if that seems a bit blunt - obviously I don’t know the make and model of your car or its likely value.