Would like to update, maybe useful for others waiting on uk tourist visa:
1. Submitted application/payment online: 4th Nov, biometrics in Bangkok 11th Nov, finally received passport back this morning (10th Dec), was valid from 7th Dec so guess this is the day they processed it.
2. Didn't bother trying to get yellow vacaination book, check the mor phorm app, click international certificate, we were able to select 'receive by email', was free, waited a day, then QR code appeared on this page in the app. Scanned it and takes you to full digital international vacination certificate with name in english, date of birth, vaccination info, all that is required by UK. Printed this and will use for trip.
Hope other people waiting in Uk visa queue will received it soon in time for xmas.
Its been an uncertain week few, something that could be avoided with better visibility into application process and current processing times.