Hi CAD,
Alas you are caught in the catch 22 situation I found myself in a number of years ago. Fortunately for me I was able to secure a role as a trainee advisor which I assume is not too dissimilar to what you are interviewing for at the moment?
All I can say is keep doing what you are doing, join the various LinkedIn groups around safety and the same for other social media platforms.
If you are a member of IOSH, get along to the meetings, not only is it good CPD but you also get the chance to network with folk from the industry.
Visit the Expo's as and when you can, again, they may not be great but they do get you out and about meeting potential suppliers but crucially there are dedicated H&S recruiters there you can talk to face to face.
Don't get too blinkered by finishing the NCRQ Dip just to add more weight to your CV, a potential hiring manager might be able to see through the parchment to a distinct lack of experience and so it may do you no favours. I started safety 6 years ago and my NEBOSH Dip 5 years ago having just re-enrolled because i didn't get anywhere near finishing the first unit, however, what i have now is an extra 5 years experience in which to better integrate what i know and what i need to learn for the next level.
Read as much as you can, where you have time and keep up to date with legislation updates that are relevant to the area you want to work in, i've found it handy in some interviews when you can quote things coming in/going out etc. It shows you are constantly active within the industry.
Finally, remember its not all about the qualifications
i've met some shocking advisors in H&S, including some at CMIOSH level
I've been in this situation a fair few times over the past 5 years due to redundancies etc so drop me a DM if you would like some advice
ExTank