Took the P38 to my local tyre fitters today - after nearly and hours work - which involved a lot of swearing and cursing the name of whoever did them up - the managed to free off all the wheel nuts for me. Best part was - there no charge as I am a regular customer. Now to wait for another rain free day to swap the disks and pads and replace the AB sensor.
Wheel nut on the vehicle are 22mm Wheel brace and normal P38 nuts seem to be a bit bigger - maybe 26mm??
27mm. A deep socket sshould go on the end of your torque wrench nicely to nip them up. smaller ones you have might be L322 or possibly a Disco.