You could have used the Emergency Passport to do a border run which would have given you 30 days stay in Thailand.
Lets ask
@Amornrat *********
.. Can a UK citizen do a border run using an Emergency Passport?
As its nighttime here in Thailand she will reply ASAP. She is an expert on this.
With your history of living in Pattaya for nearly a year...I would not recommend you apply for a new Tourist Visa as I think you will be questioned upon reentry by Thai Immigration.
Losing a passport and getting a new one no longer fools Thai Immigration.
Your old and new passports will be linked by their computers upon arrival.
Facial recognition software and fingerprinting as well will ID you and your Thai Immigration history.
If as you say you are truly flying back to the UK in Aoril, then do two land border crossing entries. Each will give you 30 days plus added 30.days extension at 1,900 Thai baht each. Total of 4 months and you leave Thailand