Doubling all the way??!!

How many times have you heard that if you take a penny and double it and so on, you quickly get to a million. Well, I thought I would take this concept and have some fun on Betfair, albeit, probably only for a short time. Starting with £10, I plan to place an even money bet/lay, then when/if it wins, place £20 on another even money bet and so on. Plan is to get to £1200, lol.
So, I suppose I need to declare my first bet, otherwise I could say anything, so the first bet is Hearts v Celtic - Both teams to score @2.12.
Here's hoping!!