From a technical point of view ... YES
Thailand is 50 cycle / 220 volts
The UK is 50 cycle / 230 volts ... used to be 240 volts but has changed to 230 volts.
Australia is 50 cycle / 240 volts
It's the cycles that is important. The voltage can vary.
Australia's variation standard is +/- 10% The UK's is +10% - 6%
All my Aussie stuff works in Thailand and Visa-versa.
The USA 60 cycle / 120 volts ... so appliances need both a transformer and a converter. Some things like computers can handle this ... others can not.
Sooo ... the simple answer is yep, should work.
Is it safe? ... unsure.
If the appliance is double insulated then the 'earth' is not required to be attached as the original configuration would have been '2 pin'.
's suggestion re the safety switch is excellent and EVERY home should have one.
Even some forgettable electricians have stuck the knife down the toaster to prise the stuck piece of bread and almost fried themselves, but were saved by the safety switch (cough, cough