Why was I denied entry to Thailand despite being a UK citizen and using border runs?

Did you originally enter on a Tourist Visa or did you enter Visa Free? If it was the latter it definitely wouldn't be totally unheard of as that would be 4th visa free entry and you would have been looking at near 8 months of continuous living on visa free entry and extensions. And you didn't really say what was going on last year so if you were in Thailand end of last year that looks even worse.

If you shuffled the deck differently it would of been better. Fly in-> fly out/in again 'then' do your 2 land border allowances. That would garnish you 8 months.

𝗜'𝗺 𝘂𝗸 𝗰𝗶𝘁𝗶𝘇𝗲𝗻 & 𝘄𝗮𝘀 𝘂𝗻𝗱𝗲𝗿 𝘁𝗵𝗲 𝗶𝗺𝗽𝗿𝗲𝘀𝘀𝗶𝗼𝗻 𝗰𝗮𝗻 𝗲𝗻𝘁𝗲𝗿 𝘁𝗵𝗮𝗶𝗹𝗮𝗻𝗱

@𝗯𝘆 *******

𝗺𝗼𝗿𝗲 𝗮𝘁𝗹𝗲𝗮𝘀𝘁 𝗼𝗻𝗰𝗲 𝗯𝘆 𝗮𝗶𝗿

Sadly for you Shane Jones there is no rule about how many times you can get in by air on free stamp entry. They can pull you aside, question you and/or deny you entry when ever they want to

I think it was the fact you flew in, then you used 2 land entries, then you tried to fly out and back again; I mean even without taking any 30 day extensions you would have been in country 3 months on just the original flight in, then the two 30 day border bounces, AND if you took 30 day extensions on those you could have been her SIX months before you tried to bounce out and back by air

So since Jan 1st you've bounced out and back 2 times and gotten the free 30 day visa exempt entries by land you're allowed for this year?

AND

You tried to fly in but were denied entry and shipped back to Malaysia?

𝗗𝗼𝗲𝘀 𝘁𝗵𝗶𝘀 𝘀𝗼𝘂𝗻𝗱 𝗮𝗯𝗼𝘂𝘁 𝗿𝗶𝗴𝗵𝘁

Sounds totally right (y)

you were denied entry based on the fact they think you're living here on free entry stamp/30 day extensions. 😮

𝗼𝗿 𝘄𝗮𝘀 𝗜 𝘁𝗿𝗲𝗮𝘁𝗲𝗱 𝘂𝗻𝗳𝗮𝗶𝗿𝗹𝘆

You were totally treated fairly as they let you go to a nearby country rather than making you buy a ticket back to the country your passport is from 😮 which they could have done if they wanted.

𝘄𝗵𝗮𝘁 𝗵𝗲𝗹𝗽 𝗰𝗮𝗻 𝗜 𝗴𝗲𝘁 𝘁𝗼 𝗿𝗲𝘁𝘂𝗿𝗻 𝘁𝗼 𝘁𝗵𝗮𝗶𝗹𝗮𝗻𝗱?

You can go to a thai consulate in Malaysia, meet the requirements for a real tourist visa to thailand, apply for it, wait the processing time, get the visa sticker stuck into your passport and then you can enter thailand by a land border to get stamped in for 60 days

Most people keep back a free land border entry just in case they do get denied entry by air so they can at least cross by land and get in free stamp. You don't have that luxury. You get a tourist visa and come in by land (wouldn't come in by air even WITH a valid tourist visa as you run a higher chance of being pulled aside from the entry/stay history)