I had a call from Mark at VJ Technology who said that they had been suffering with a poor service on their radio stations being received via DVB-T / Freeview.
Upon inspection, it was clear that even though they were able to view the available Freeview channels, the radio channels were being affected by 4G/LTE interference that is being transmitted from a 4G mast just down the road (outside Leverton Cat).
Once I had rectified the issue, the office staff now have their radio back (Kiss FM seemed to be the preferred option), and they are happy workers once more.
ashfordvision's Blog 