Replacing O2 sensor on Vantage

[bogie]

OK, Im pretty confident one of the O2 sensors is buggered as its been throwing the same code for months now. Sensor stuck. Its "bank 1, sensor 2"

now for the life of me I cant find in the manual where it says which side of the car is bank 1 and which is sensor 2.

...my neighbour has a garage with ramp, I have the £60 O2 sensor, but don't know which one to replace

Can any of our resident Aston techs advise?

TIA
bogie

[BamfordMike]

Bank 1 is driver side / cylinders 1-4
Bank 2 is passenger side / cylinders 5-8

Sensor 1 is upstream cat
Sensor 2 is downstream cat

[bogie]

thanks Mike