You are in the Victoria area just after 1100. You have a meeting in Whitehall at 1230. You want to go to Confession.
Go to the Cathedral. Join the queue which is several strong at 1110 even though confessions begin at 1130. Join the shuffle which enables you to focus on the Lady Chapel: the "Tota Pulcra Es", which draws you into the "Ave Maria", which draws you into the mosaic of the life of Our Lady.
Wait your turn. Worry about the time.
Tell yourself to stop worrying.
Go to Confession.
Get one Our Father (that's right: ONE OUR FATHER) as your penance.
Say your Our Father. Feel guilty that the good priest seems to have noticed your briefcase and suit and not how much of a wretch you really are.
Say your Our Father again because you were thinking about the above.
Decide a decade of the Rosary would have been a better penance and say it.
Leave the Cathedral at 1205 and arrive in Whitehall early.
Say Deo Gratias.