I have found Moses Brent and Martin Bird but am unsure who or what the following A.T refers to. They are eclesiastical, a small dish/tray and a small goblet. Any info appreciated.
The MB AT mark was registered at Goldsmiths Hall in 1881 by Michael Joseph Cunningham Buckley and Arthur Scarlett Thomson trading as Cox, Sons, Buckley & Co from 28 & 29 Southampton Street and 43 & 44 Maiden Lane, London. They specialised in manufacture of church furniture, stained glass and metalwork.
For more history about the firm see Volume 1 page 100 of The Directory of Gold & Silversmiths Jewellers & Allied Trades 1838-1914 by John Culme.