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Is this something I can reasonably do myself? It appears just unplugging cables, then plugging new ones in, making sure they're clear of the exhaust and then putting some heat shielding conduit on them. A meter of conduit is a fiver. The cables are 30-40 quid a set. Quotes I've seen on forums for the work are 200-300 including parts at independents and 300+ for dealers. It appears a common thing on 2010 TSI for it affect, in particular, number 3 HT. More recent models had the routing in a different place, tied back with proper heat protection.
Aftermarket and a decent make will be fine, see if a local motor factor is cheaper than dealer and halfrauds.