sure but in the past the thai embassies have not specifically stated on the visa exempt requirements page that you can extend for 30 days. Its always been stated elsewhere. Now its specifically referred to in the exempt conditions since it went to 60 days
my gut is youll be ok. Might be worth searching fof a cheap flight to Kuala Lumpar so you can book it instantly if they want it with 60 days. Despite what some will say, none of the rules are set in stone. Depends on the officer at the time
It wont improve for a while as its only just lost 3.5thb in the last 2 months annoyingly. The cheapest way i found was to take pounds with me and exchange at one of the booths in the larger shopping centres. It saves around 6% on using ATMS with uk card