In contrast I put only 5 GBP into BTC and traded in multiple times daily whenever I wanted to, so far over a few days.
It took little time to set up but less than a week and was fairly easy to do this using Britcoin and was then even easier to put some of the part bitcoin I had now already purchased with GBP and is in Britcoin into MtGox.
I have 0% charge on each trade, 0% running costs each day, 0% charge for adding or withdrawing money, no or practically no loss due to rounding and 0% trading overhead charges with no additional charges after that.
It's easy to perform a buy/sell and
http://bitcoincharts.com/charts/mtgoxUSD#rg2zig1-minzvztgMzm1g10zm2g25 has a good ratio of simple to powerfull showing me to the minute whats happening.