Flying to Canada Saturday afternoon.

How busy is terminal 5 at that time of day? Do you reckon we will have long lines for security etc. around mid-day to 1pm?

Flying first - so not sure if the fast lane will be any faster at that time

It is the first dayof half-term, so I expect it will be very busy - but not sure if those flying to say Europe are in the same area as long haul?

Thank you.