HELP!!! My Polar has totally locked up on me. Nothing is happening when I press any of the buttons. I've tried resetting it by pressing all 4 side buttons simultaneously but still nothing. I've also tried using the unlock function and nothing, although this isn't surprising I guess as the keylock symbol isn't displayed. All the Polar help desks seem to be closed for Easter. Does anyone have any ideas at all as to what I can try next or if there is anywhere in London I can take it? Don't want to have to send it up to Warwick to have it fixed. HELP!!!!!