The event will run from 2:30p.m. to 9:30p.m. (GMT) and the exclusive sign-up bonus on vMall will bag you £20 off the Honor 5X (or equivalent in other European markets), as well as £10 off the next purchase. This additional £10 voucher will be sent out after you've made the initial purchase of a new Honor 5X. You'll need to register soon if interested as the window closes on February 4 at 10a.m. (GMT).
For more details, be sure to check out the store listing over on vMall. There's also an event countdown to keep you on top of the upcoming launch.