They can now only be rented for special occasions . Clearly our group constitutes a special occasion . We all hopped on - well in between taking pictures - and headed to Parliament Square . We got a nice view of the bell tower that houses Big Ben ( the bell ) as well as the Parliament buildings . We spent the remainder of the morning touring Westminster Abbey with 2 Blue Badge guides .

Pick your answer from: (I) They are there on a school trip .; (II) None of the above choices .; (III) They are there to rent a car .; (IV) They are there with their family .;
Answer the following question: Why are they in London ?
(I)