a few thoughts -
I pay something around £ 450 a year for insurance and breakdown cover. That's with being in what's considered a low risk job, somewhere outer suburban / rural-ish, and with maximum no claims discount. With no licence history / no claims it's potentially going to be a fair bit more, and I've no idea where you live -
where I live is ranked a B on this list (A is lowest risk / price, F is highest, 'refer' means it's going to be bloody expensive.)
The breakdown bit is maybe 100 of that, but in theory avoids the risk of being stranded in the middle of nowhere. (although with previous provider who were RAC, that turned out to be a possible.)
Insurance will be slightly lower for an older / lower value car (mine is worth maybe about 5 grand), but the damage you can (potentially) do with one is similar so it's not going to be half that for a car worth half as much. Going comprehensive with a reasonable excess (the amount of any claim you pay) can come out cheaper than going for 'fire, theft + third party', for reasons I don't fully understand.
Annual MOT and repairs / maintenance is going to be at least somewhere round £ 150 a year, more if they find anything dubious. Last year, I probably spent too much on an old car hoping that each repair would be the end of problems for a year or so. In the end I had to scrap it, which got me about £ 200 in scrap value. Generally speaking, any car is losing value all the time it's on the road (although car before that was old enough to have started going up in value again.)
Car tax varies according to CO2 emission banding.
This banding is not the same as what triggers Ultra Low Emission Zone charges - these apply in some city centres,. and generally, older cars (especially older diesels) don't meet the ULEZ standards and you have to pay a daily charge for going in to the zone (don't know if that might be an issue for you.)
Some places are trying to implement higher parking charges for non ULEZ compliant cars.
Is having something cheap and potentially unreliable going to be an issue with new job?