The closest tube station to Ironmongers' Hall is:
Barbican tube station 
(Hammersmith and City/ Circle line)
 Abbey City Cars
50 Old Street, The City
London, EC1V 9AQ Rosenberg Car Service
55-57 Rosebery Avenue, Clerkenwell
London, EC1R 4SD This is the home of the Hackney Carriage so for a more ‘London’ experience 
get on the street and stick your thumb in the air and jump in a black cab. 
That’s if they’ll stop for you...