That's a great tip Rogfam, we got a Platinum last year and got a great deal at the Savoy hotel on an independent trip to London. However, I guess the deal could be different depending on the season whereas Tauck's deal is the same all year.
Has anyone booked extra days through travel sites (like Hotels.com etc) rather than through Tauck? We plan to arrive several days early to acclimate to the time change. It looks like we'd save about $200 per day booking independently.