steering wheel friction to the left

got a bit of a problem... the disco drives straight and nice, breaks straight etc, but when moving the wheel to the left, there is some friction/rubbing and you can hear it, theres not any problem with the steering , it sounds like its more in the between wheel and bulkhead area , rather than under bonnet

mate had a look yesterday after doing the egr and front pipe and other bits, said the steering fluid is all as it should and looks nice and clean, and thinks its a "dry joint" somewhere , but hes not a disco expert,and said he didnt want to start taking things apart without my go a head

so just wondered what the thoughts are on what to check and its likley cause ?

im still under warranty so im going to pop back to the garage to get them to sort it out if thats what i should do ? , however id like to be armed with likley things it should be and generaly just wanted to seek thoughts and advice ftom those in the know