Do the ITQ at Level 2 and any other qualifications you are offered. As an employment adviser, every day I deal with individuals who tell me that their qualification is higher than one which is listed as essential in a job advertisement, but they don't get offered the interview. It is a lot easier to negotiate and be successful if you have the qualification an employer is looking for. If ITQ Level 2 is your employers next step, then complete it. If it's to become the mandatory minimum, then, professionally you need it.