You can do counselling still. I have a small private practice with my MSW, and I did family work with my last job where my previous boss told me I could do straight counselling in the organization if I wanted to. I sometimes have to explain that my training was different in the States, and I've had to quit using diagnostic labels that I had to use for insurance in the States (it isn't legal for counsellors to diagnose in the UK).
If you want more credibility, you may want to join the NACP (
www.bacp.co.uk). You should qualify; you just have to show that your training met the required standards. I was going to do it, but haven't got around to it as I don't have the funds for several memberships.
There are schools that do training for clinical social work in the UK though--just so you know. Not many people realize it, but there are social workers doing counselling. I have a friend who did clinical training in her masters of social work at Oxford, and when I set up my liability insurance with BASW, I spoke with them about making sure my counselling was covered. I was told that while not many did it, that there were others in BASW doing clinical work and that it would be covered by the liability insurance.