(I'm not quite sure I follow you - what do you mean "no EU signal"? I am guessing you mean "no UK spot beam signals"?)
In any case, from what you state, you have done all the right moves:
1) tried a different LNB (no difference to either STB or meter)
2) tried a different lead (no difference to either STB or meter)
3) tried re-aligning the dish (azimuth and elevation, one after another, plus skewing the LN
.
4) compared meter to you home setup (where it works)
If you can answer affirmative to all of the above, and believe you have done them all fully, then I can only speculate that the dish has been hit by a heavy bird or something warping it sufficiently out of shape to allow reception of Europe-Ku beams, but not enough for UK spot-beams.
Can you show us pictures from the installation, please?
It would make things a lot easier to address...