The problem with swapping race numbers is that if you collapse and require emergency medical treatment you could be given drugs that you are allergic to, or an on going illness that you have may not be dealt with, as they will think that you are someone else.
Also, they would notify your next of kin that you have collapsed, when in actual fact it would be another runner that has been taken to hospital.
It's shocking how few people seem to be wearing a poppy this year compared to previous years. The money goes to looking after British servicemen and women who have been injured fighting in various conflicts around the world, and also to help the families who have lost loved ones in action.
Surely it's not too much to expect people to buy a poppy and wear it. Wear your poppy with pride.