Darren, you don't mention where you come from, but if UK an International driving permit "IDP" from post office easy with your UK license. £5 I think
If you are staying in Pattaya, if fairly easy to get a Thai license, 2 or 3 visits to the testing station, in 4 months you have plenty of time to get one for car and motorbike,
if you're planning future visits, good idea to get it done
There are a ton of threads on here and other forums on the process how to get Thai license