Is it possible to stay in Thailand long-term using flight visa runs without issues?

It's simply not possible to live in Thailand long term using just visa exempt entries or tourist visas any more. It's got much more difficult since visa exempt moved to 60 days in July. People are regularly being denied entry. You need to get a visa that's appropriate for your stay

So after reading the comments I ideally like to do 6 months in Thailand and 6 months in the UK working, I've just come in on a 60 day exemption which ends 26th December, what would the best thing for me to do for the other 4 months?

I did it 2007-17. No problems.

Use a decent border run company like Lime ,they have there businesses set up for there profit and the immigration officers ,they check your passport before leaving with immigration ,so you will know your going to be ok .There are no clear law stated in this and why would Thailand put up visa waiver from 30 days to 60 days if they didn't want to encourage more people with different entry or visa methods ,there putting it out to a vast market of tourism of options ,but obviously if your doing for so many times it shows your actually living here ,they might question you ,but if your staying over 9-10 months there are visa options for living here ,but a tourist can stay a long time and still be a tourist .

did it for 10 years never a problem

Done 1 year 3 months on tourist visa and visa runs 😁

Been doing this since 2018, I follow the advice of a border officer at DMK airport. Stay 30 days, visit another country for a few weeks and come back for another month, never had any problem.

The most cost-effective is the education visa, which does not cost money to open an account

I come to Thailand for 24 days then go back to work for 4 weeks then return to Thailand for another 4 weeks I've been doing this since March using Visa exempt ,

haven't had any problems yet I'll spend about 150 days a year in Thailand

Would you.expect me to have problems if I keep.doung this ?

Just do a land border run

This hasn't really been possible since Covid. Around that time they started pulling people out of line at the airport and grilling them if they've spent too much time in Thailand without a proper visa. Nowadays it's even worse and they're denying entry to people that are abusing the system.

You cannot live in Thailand without a long-term visa because eventually you will be denied entry.

But why are you even asking about this? With the new DTV visa it's trivial to make yourself legal.