Yes - pre-booking is essential to guarantee entry to all attractions. When you purchase your pass, all you need to do is to book your visit date and time for the *lead attraction. Once you have completed your purchase, you will receive instructions on how to book your visit to the remaining attractions with our online booking portal.
*Lead attraction is the first attraction named in the pass, i.e. London Eye is the lead attraction for London Eye + Madame Tussauds
If you have purchased a Big Bus Tour with your pass from Big City Saver, you do not need to pre-book a date and time for Big Bus Tours. You will receive an additional email with your Big Bus Tour ticket. simply redeem it at one of their bus stops and you'll have access to the Big Bus Tour for the whole day.