HI,
certainly this is a big field and isn't likely to go away any time soon. As others have said, the goal posts are constantly moving, so if you aren't comfortable with constant change, this isn't the field for you.
The ISO27001 certification will certainly help your chances and may well be mandatory for many, if not most positions. The fact that you have attained these certifications will demonstrate that this really is a field that you want to join and committed people can be recognised by the companies providing or using these techniques.
You say you are looking towards a consultancy role. There are commonly two classes of consultants, the "Talking Heads" and those with the experience to know what they are actually talking about. From my experience, I've found that the kind of people working in end user companies in the security field are pretty sharp and committed people and so they will spot and discount a Talking Head in about two nanoseconds! What I'm saying is that I think you will need to get some field experience and in many respects, if you can gain that experience in the police IT forensics group, that would stand you in good stead.
I am aware that the police force does have some close ties with certain government departments that might offer openings for you. Also, there are the security forces, particularly you might think of South Gloucestershire!
Good luck with your search!