Most DMR activity is centred around the 70cm repeater networks, but DMR simplex activity does exist on both 70cm & 2m, and performs very well indeed! Program the UK DV channels into your radio and add DH3 to your scan list.
DH3 438.6125 (calling channel)
Program your radio for Colour Code 1, Slot 1, Talk Group 9 (local)
Many commercial codeplugs already have the UHF DV Simplex channels configured, so give a call!
Why not give 2m a try as well, the DV calling frequency is 144.6125, same details as above.
For those with the 146-147 NoV, also try 146.9000 to 146.9875 - no official calling frequency up here, so scan all 8 channels.