I think the arms on the left as you look at it are those of someone belonged to the Bek / de Beke / Beake / Becke family - there are many variations on the name.
This family produced several Bishops - I agree it is definitely a Bishop's mitre above. I am struggling to make out the two things on the right of these arms (the left hand side) - they could be annulets? If so Papworth's Ordinary has nothing about them.
On the right (the arms with the green background) I'm not sure what the black splodge is ... so haven't got far looking it up yet!
The little hand in the corner is a "hand of Ulster" and denotes the bearer was a Baronet.
The puzzling thing is a Bishop would usually impale (to put arms side by side in one shield) his arms with those of his Diocese. So, although I have no evidence to support my theory I think it is possible the arms shown are those borne by the people being commemorated but there has been some artistic licence. (Eg by adding the date and by showing the bearer was a Bishop, but leaving out the arms of his Diocese. Maybe even adding things like the two "annulets".)
Liz
PS They are definitely arms - the crest is the bit that sits on top of the shield.
