Is that a 'specialist' or a 'socialist' you mean there ? 
From memory here's a good reckoner...
Lambda probe anywhere from 60-80 quid approx. Get Audi or Bosch part only. Half an hour job if you have the right tool (another 20 quid or so).
Thermostat including seal shouldn't set you back more than 25 quid. This can be an evil job and you should reckon on changing the two coolant hoses in that area at the same time. Reckon on a tenner for those. Given the amount of disassembly required to get to this part of the engine, reckon on four hours for this task.
Paul

From memory here's a good reckoner...
Lambda probe anywhere from 60-80 quid approx. Get Audi or Bosch part only. Half an hour job if you have the right tool (another 20 quid or so).
Thermostat including seal shouldn't set you back more than 25 quid. This can be an evil job and you should reckon on changing the two coolant hoses in that area at the same time. Reckon on a tenner for those. Given the amount of disassembly required to get to this part of the engine, reckon on four hours for this task.
Paul

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