[1] St Thomas's Church was built in 1758-62 in Marlborough Street when the parish of St. Mary's was divided to cope with increased population.

The architect of this church (and of St. Catherine's in Thomas Street) was John Smyth.

The design is modelled on Palladio's Il Redentore in Venice.

[2] £2000 was granted by Parliament for the building of the church, and later another thousand pounds to finish it off.

At the time it was considered to have the most beautiful facade of any church in the city,[3] built in the Palladian style similar to St Catherine's Church on Thomas Street.