Here is the schedule;
Mon 6 April (10am- 9pm) inside and outside.
Tues 7 April (9am-9pm) inside and outside.
Wed 8 April (8am -7pm) inside and outside.
What can we expect? I know set photographers are going there, so we can expect photographs! Personally I expect to see David Tennant, Bernard Cribbins, Catherine Tate (if she is in the story), Jacqueline King (ditto), and maybe others too!
David Tennant is a guest on Jo Whileys show on Wednesday, it runs from 10-1, so he may not be on set until mid afternoon (unless it is recorded)