Got them from bikediscount.com
Did all the shaking and spinning as per Schwalbe instructions but had to use CO2, couldn’t get anywhere with my track pump.
40psi in them and feel fine, no Stan’s escaping at rim or valve or noticeable anywhere on tyre. Immersed and tiny, tiny, bubbles escaping from the tyre all over with no sign of the Stan’s.
Now the beads are in place I should be able to get them up with a track pump if I loosen enough to change the Stan’s over for fresh.
Maybe just a duff batch but thanks for all the advice.