You're welcome, but seriously no one can say how long your car will last.
I used to run £200 - £400 sheds for years, some are possibly still on the road, most are probably washing machines or fridges by now, but with a car that age/value/state, if they see you through a few months it'll have been worth it. I had an Audi 80 I paid just over £300 for which lasted 4 months (doing nearly 7000 miles) I gave it it's second service a week before the cam belt snapped, had that botched and part ex'd it for my VTR, getting £900 off the price with the Audi. I bought a Volvo 340 as a temp car it only needed to last a month, and ended up driving it to my parents house where it was used as a spare car they said they'll get rid of it when it needs something fixing, it flew through two MOTs with out needing anything doing at all. With a cheap shed just keep in mind that's what it is don't spend money on them, other than fluids etc and drive them well and you'll normally get your moneys worth out of them, anything else is a bonus!!!