411/412/603 wheel nut torque?

[Kevin H]

Does anyone know an official recommended figure for the 411 wheel nut torque with the Avon Safety wheels fitted? (I assume the same would apply to the 412 and 603)

This leads to another question - if a 3rd party car mechanic is working on your car, is it your responsibility to tell him/her what the wheel nut torque should be?

Or put another way, can a mechanic deny or reject responsibility for a road wheel falling off because I as the owner of the car have not told them what the torque should be?