Misc: slugs have 4 ______?

Questions

Of which Londaon Palace is the Banqueting House the only surviving part?

Where were the first parking meters installed in London?

The names of theseven regiments which form the Royal Guard?

Where in London was the Scottish Leader William Wallace hanged, drawn and quartered in 1305?

London, which street was thought of a cordon sanitaire to separate the East End form the West End?