Sadly, yes. £228.20 for a new pump kit (includes fluids and everything needed), from haldex repairs, and then probably an hour labour (if that). That's why I asked about this replacement motor mentioned above and wondered if it was some other component I didn't know about.
Having said that, haldex repairs are very cheap despite it being the OEM kit. I only knew about them from my local garage who are a VW specialist and do their best to look after their customers. Obtaining exactly the same kit from elsewhere can cost an awful lot more, especially from an Audi garage.