I don't need to: I know exactly what PASE and MEN have to say about who is and is not a qualified teacher.
I share my opinion as a living, breathing example of someone who is employable (and employed) based on the acquisition of a TESOL certificate which, incidentally was NOT a three-day course.
And I can also share my experiences as somebody who as worked alongside 'teachers' who had no qualifications at all other than those which had been photocopied and/or were running from the police in their home nation (although clearly neither of those apply to your good self). 'Can get a job' is by far from being the same as 'will get a job worth having'.
TEFL / TESOL / CELTA are widely accepted for teaching positions anywhere if accompanied by other relevant skills and/or qualifications.
But the CELTA is good enough by itself.
BTW, I live two tram stops from you. Fancy a beer? Pardon To Tu has recently got draft Ciechan....