I think Jamie may be a wee bit injured tbh. I saw something on Instagram I think she has he getting his jaw realigned but it was something to do with his hip or other part of body but manifesting elsewhere.
The other British entries who didn't make it were:
Mr and Mrs Murray Sharan
Have Sam & Divij ever played mixed together?
Not ranked anywhere near high enough to make draws usually.
As Wolf says, bigger draw and weaker field here (hardly any singles players competiting, particularly on the men's side), but another couple of late withdrawals would get this pair in.