do they not have radar to monitor visual approaches

They have NO radar at all.

As for “comet landing at Nutts corner 12-15 years ago” I have been a controller at EGAA/BFS since 1986 and I have never heard of it.I remember a DanAir 748 landing at Langford and a Bulgarian TU154 tried to do the same when I was tower controller one day but the comet…..nope new one on me.(although the proximity to the 35 approach would lead me to suspect it has been tried 🙂 )