UK Passport Holder Question

[shadyacres29]

Hi,

 

I will be entering Suvarnabhumi with my standard 30 day stamp, then flying on to Manila 2 days later, then down to Ho Chi Minh, then bus over to Pnohm Penh and finally fly back to Suvarnabhumi.

 

Will I be able to stay longer than my 30 day stamp due to entering any of those countries and coming back to Thailand?

Any visa advice greatly appreciated as my total trip duration is around 34 days so 4 over the allowed visa.

 

Thanks for any replies on advance