What would the Roman Catholic Church position be, should I declare myself “member of the Church of England”?

I am a Roman Catholic, baptised when I was a child and later confirmed and have received communion. The Roman Catholic Church is the “default” church in my home country. I have now moved to the United Kingdom and find myself attending mass in a parish of the Church of England — quite “High Church”, although I don't think it matters. (I could reasonably attend mass in a Catholic Church, but the community + practical reasons make me feel better in the Anglican church.) I would like to take an active part in the parochial church council. For this, I shall enroll in the church's electoral roll, and declare that: > I am a member in good standing of a Church (not in communion with the Church of England) […] and also **declare myself to be a member of the Church of England** […] What does the Roman Catholic Church say on its members declaring themselves (also) members of another Church?