If you've got stocks bought via one broker and thus chess registered via that broker, can you sell them via another broker - or do you have to transfer them first - and if so, how long does a transfer take?
e.g. hypothetical scenario - you've bought a line of stock via broker A. On the day/time you want to sell them, broker A's systems are down and thus their phone lines are also clogged. You've got an account with broker B - can you use broker B to sell the shares bought via broker A, and if so, whats the process for doing it and do you need to contact broker A in some way before broker B can sell them for you?