Please help identify these hallmarks

[Ziggystardust]

There is no city stamp, and I can't work it out. Also is the maker known?

[Sasropakis]

It's London G=1802 and the duty marks is George III. The city mark wasn't used for small items like teaspoons and sugar tongs. The maker's mark is probably upside down and as far as I can see it's TW for Thomas Wallis II.

[Ziggystardust]

Thank you so much for the quick reply.