What do I need to know about immigration procedures when entering Thailand with a one-way ticket?

Hello folks,

Update on my last post.

Flew with Aer Lingus/BA from Belfast to Heathrow then BKK.

Didn’t ask in Belfast or London when my return date was and in immigration at BKK I didn’t fill in my return date on TM6. Went through the Thai only section as was with my wife.

No questions asked at all.

Still I took advice and had a cheap flight to Penang within the 30 days and have my original flight for start of May.

Thanks for the advice people.