trlane harness bar bolt holes

I have a TRLane harness bar and GPV roll bar.  The bolt hole it came with mean that when I fit the should straps for my harnesses the outer buckle fouls on the rollbar upright. This doesn’t prevent the harness from being fitted or me from wearing it, the issue I have is , a scrutineer may not like it as it cannot move freely left and right in an accident to stay lined up with the seat.

 

Can anyone recommend someone near Bristol who can drill the holes ?

 

I think I will also have to rotate the bar though 180 so the new holes are on the opposite side as I am not sure of the minimum safe distrance between bolt holes for harnesses in TRLane harness bars.