NorthSouth, in common with most airfields in the UK the users are many and varied, there are many ATC instructions involved and there's a mix of IFR and VFR.
However, if the aircraft is VFR the responsibility for not ramming another aircraft rests with the the Captain regardless of ATC instructions. That goes for both aircraft involved.
We will not know what the ATC instructions were, what traffic information was passed or what each aircraft was actually doing until the AAIB complete their report.
I am absolutely NOT trying to blame anyone, it's a terrible accident that I feel close to and one that I hope we can all learn from.