How long does it take to renew an Italian passport in London, UK?

Answer 1

best is to inquire at the Italian Embassy/Consulate in London..it depends on the process...and the requirements needed.
Embassy of Italy in London

Address:
14, Three Kings Yard
London W1K 4EH

Tel.: [phone]
Fax: [phone]

Answer 2

Should not take more than a week, if every thing is in order.

Contact them for more information at:

Tel.: [phone]
Fax: [phone]

All the best!/