What steps should a British expat take if he needs to apply for a new passport while on a tourist visa in Thailand?

Hi guys .I've tried looking on here for this answer but no success. Wonder if guys can help a friend of mine British ( seriously he is panicking)

1) He needed to go to Vientiane asap to get b-visa all is in order paperwork etc

2) He's just realised he only has 1 blank page in current passport

3) He's currently on Tourist visa 60 day and has already got his extra 30 day (1900b via immigration office) this expires in a couple days

4) Obviously he has to do a border bounce to get a 30 day exempt (Ok with the 2 per year as hasn't done one)

5) Then the ongoing what's process to get new passport ?

Thanks in advance guys