Sherlock's Home

I dropped by No. 221B Baker Street on the way to Marylebone Station this evening. Although the brass plate said "Visitors for Mr Sherlock Holmes or Doctor Watson please ring the bell" there didn't appear to be anyone in.

Then I noticed a blue circular plaque on the wall above bearing the words 221B - SHERLOCK HOLMES - CONSULTING DETECTIVE - 1881-1904.

It seems I've called round too late - an elementary mistake!