Possible water ingress under footings

[Lithgae]

I have a long standing damp problem in a small room. It has been complicated by multiple contributing factors which I have now fixed (rotten joists, poor void ventilation etc) but there is one section on an internal wall that was baffling me. Poking around outside thinking that it was something to do with the vent I noticed that was very easily able to poke a hole with my fingers under the footings and within a few minutes nearly my whole hand was under. The ground level at this point is very close to the floor level inside, and the other side of this hole is an Edinburgh cupboard/meter cupboard which has always been damp at the base, but also the internal wall which has dampness at the base. So, my new theory (i've had a few before this one) is that water might be running under the wall here and possibly even into the cavity of the internal wall, causing all of the damp in this corner.

The question now is what to do about it. Obviously I have to fill the hole, but I feel like I have to do something more with this section and somehow shed the water away from the base of the wall. The footings are clearly already very shallow here as the front of the house appears to have been lowered in Victorian times and I will need to be careful not to disturb them any further. I am thinking maybe trying to clean away the dirt as much as possible and that cement/concrete rather than lime might be better here, to make a kind of protruding ramp at the base of the wall, to try and push any rainwater away from the base of the wall.

I would welcome any thoughts/advice.

 

[Lithgae]

Did a bit more work on this and found that the hole on the inside leads into the meter cupboard where the main electrical incomer enters. Not quite sure what to do now. I would have been include to position a few blocks in this area and pour concrete in to stabilise everything, then do the same with the hole on the outside, but not sure if I can do that around the incoming electrical mains. Where this cable comes in appears as if it might be part of the problem as its obviously been run through where the footings should be.