Please say someone other than me has read this fabulous mix of time travel, science fiction, Golden Age detective story and loving recreation of Victorian manners!
It's all about a hero who has to travel back to the Victorian age to repair an anomaly (due to too much time travelling by his colleagues) and gets embroiled in croquette games, jumble sales, boat trips up the River Thames etc.
This book is the most heart-warming mix of Jerome K Jerome, PG Wodehouse, Agatha Christie and Dorothy Sayers - and believe it or not, was written by an American (Connie Willis) but I have yet to find anyone other than me who has read it!