Finally! 
Thanks to @M1RTB and @MW7MWZ for FM contacts on G/WB-003 Stiperstones and SSB contacts (my first for this year’s Challenge) with them on G/WB-005 Long Mynd - Pole Bank, on G/WB-002 Brown Clee and on G/WB-004 Titterstone Clee, all made using my KX3 with the UR3LMZ transverter, and a 5-element Yagi arranged vertically and pointing in roughly the right direction.
The Yagi is at present very much fixed in all axes. I guess some sort of rotator and/or polarization flipping option might be in its future. 