A company we installed some shutters for have not paid; we subsequently found out the company applied to be dissolved (shortly before the installation) and was formally dissolved (shortly after the installation).
At no point were we advised of the above.
How can they apply to be dissolved and then trade afterwards?
This is a little outside my area I'm afraid. You should consider rights against the directors, rather than the company, as there is now no company to sue. This note from Taylor Wessing is a good place to start your research: