Cornish 2m beacon GB3MCB

I have still to copy this beacon on my FT817ND and 3el from a decent site!  Beam heading is right, so I guess it must be too weak to copy except in lifts. I could copy GB3CTC years ago, weakly but 100% of the time, from a poorer site in this village on a 5el with more lossy coax.  Is GB3MCB much weaker in East Anglia or is it me? I am listening on 144.4690MHz with a 250Hz filter, so very surprised not to have had even a brief ping to ID it by. Is the beacon GPS locked? Is the 2m beacon transmitting even? I am beginning to think it is off-air.

By contrast GB3NGI (further away in N.Ireland) is nearly copyable all the time.