three satelites in a triangle

I live in Stroud Glos, UK, and just saw three quite faint light passing from
nnw to sse almost directly overhead. The local time was within a few minutes
of 22.30 BST. There was one leading with two trailing. the rear two were
about three times as far from the front one as they are from each other.
They passed in front of three seperate stars which were clearly visible, so
I am certain it was not a very slow low plane, and there were no navigation
lights.

Is it possible that this could be a satelite group that is not listed in
heavens above?

I realise that I am new to this group, buty would REALLY appreciate any
assitance, since in many nights of watching the sky and satelites, I have
never seen anything like it at all.

Thanks