OP, don't worry yourself unduly about high mileages on the clock. You need to be looking for good examples which have been well cared for and had proper maintenance on them.
Look at taxis as a guide to which diesels can take that much driving - a diesel is a good idea for you as your p.a mileage merits it.
I echo the Skoda suggestion. The Octavia is also a good bet.
You wouldn't have to worry too much about DPF issues as your mileage is enough to burn all the deposits off and regeneration shouldn't be a problem for you.
With £5k, and the DPF worry out of the way, the world is your oyster. The Honda Accord is a decent comfy cruiser, and a Mondeo would also be nice to drive. Lots of different trim levels too so you can find something to suit. £5k gets you around an 07 plate.
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