I bought in at £330. and now the price is £255-£260. ..... And i thought the price was going up.....
You are going to lose all your money! Now, to make sure you lose everything you own, keep buying BTC in increments as it goes down every 50£. This way you will gather up a huge loss but have the feeling that that last BTC you bought is doing good as it comes back up for air a bit. If it does go up 50£, sell it and you made 50£ though you are still holding the bag on the rest.
Have fun, don't stress out too much yo!