As generally agreed here, as long as the marriage was legally recognised in the country of marriage, you are married. That you did not register it with UK was your problem.
As you appear to be living in UK, I believe you can get a divorce there. Just inquire at your local Country Court. If you can then you do not NEED a solicitor. Again seek info from the County court or even on line.
If you now got a non-impediment cert in UK, by not declaring you are married, you would commit a criminal offence, as you must swear on oath you are not married, that would be perjury.
