Would you recommend the Cert IBET (Certificate in International Business English Teaching) offered by both UK English and Trinity College London? Why?

Knowledge has no limits even if it's about a language. Certificates, Diplomas and degrees are recognition of a specific level of knowledge acquired by the candidate. A part from other benefits these are essential to boost self esteem. One has to go for these when found an opportunity.

Having a certifications is definately an added advantage when teaching English. My advice is to go for the certification.  

Sure I would - this is a very highly respected college with a very valid and decent Certificate to have 

It's certainly a good course, provided you already have a diploma in ELT. You have great chances of employment once you pass this course. A word of caution - native speakers are preferred everywhere even if you are a professor of English.

Certainly yes. The certificate will equip you to teach English for Specific Purposes, anywhere in the world, especially in the Arab world. It is equal to CELTA / TESOL.

Thanks for the invite,

I do agree with, and vote up, the answer provided by Mr.  anayat bukhari.