It has subsequently transpired that Lakenheath, though well beaten, were unhappy that they were not allowed to replace their captain with a substitute at the end of his ten minutes, which apparently is allowed in the regulationl. (Your ignorant correspondent was unaware of that!) Whether this had been by the referee or the fourth official is not yet clear. So, a game that was in no way unpleasant in nature, ends up by being controversial, though the threatened appeal by the visitors seems unlikely to get them anywhere.
Lakenheath are correct. A player twice sin-binned can't return but can be substituted at the end of the second sin-bin. I have to confess that I have struggled to commit the niceties of the sin-bin regulations to memory; I have a little cheat-sheet tucked into my book just in case. It astonishes me that a team of four have got this wrong. I am almost as amazed that the Lakenheath bench were aware of the rule. Perhaps they have rather more experience of sin-bins than they ought to have.
I am not sure that I would dismiss Lakenheath's chances of a successful appeal.