Running Rough Tiger

Not having much luck, went out for a short ride and to put some petrol in the bike as the gauge showed on the red, the bike is running very rough at low revs, if you give it some throttle it picks up but at low speed it hunts terribly.
I don't think the bike has been run for quite a while as the last poor owner died of cancer so it may have been garaged up for a long while, the tyre pressures were very low too, which seems to indicate the above.
I though some new fuel and a run might cure it but no.
I have a guy down the road from me called the motorbike doctor (sussex) I will run it down to him next week and see what he says, hopefully it just needs the throttle bodies set up. as it has a full service history and the last owner was a engineer and kept the bike immaculate.

May also check the air filter and fit a K&N if it doesn't have one
Unless anyone has any other ideas before I have to spend money at a garage.