The motorway is a different matter as there is far less hazzards.
I'd stick with it and get the repairs done.
What else are you going to do? Sell it, get another cheap car that will quite probably have just as much wrong with it, or possibly worse?
Better the devil you know..... assuming it is just the clutch.
With older cars I think you also have to offset the cost of repairs and what it is worth to the cost of finance and depreciation of a newer car. A £4000 car might loose £1000 in the first year of ownership.
It seems with my car a new cylinder head is £25 etc so if I could do the work myself everything is so cheap I reckon even a new head gasket could be had for £100 inc labour but the £80 labour charges are adding up