Thanks Quaxer. What you say makes sense of why I have found a reference to a marriage licence bond for Samuel GOUGH (to Anne VICKERS in 1740). It might also explain why in 1765 his daughter Hannah GOUGH married Thomas SPARROW in a CoI church - St Catherine’s, Thomas Street. Samuel left her some property in his will.
And thanks Aghadowey. I wonder what made Ebenezer Kelburn so unpopular. I suspect you are right that no records remain from this period for Plunket Street and Usher’s Quay.
For anyone else interested in non conformist churches in Dublin at the time of Rocque, I found this article by Kenneth Ferguson in the Dublin Historical Record (Vol. 58, No. 2 (Autumn, 2005), pp. 129-165) - “Rocque's Map and the History of Nonconformity in Dublin: A Search for Meeting Houses”.
Thanks again to all who responded.