Betfair are offering a free £25 bet on the Grand National this weekend. You'll have to put the £25 bet on yourself, and then you'll get it back (this worked for me, and lots of others, last year). New accounts only.
1) Open your account (takes less than 3 mins) using promotion code NAT333.
2) Once you've made a deposit into your account, place your bet.
3) If your first matched or "each way" bet loses, we'll credit your account with the value of your stake (up to £25) within 48 hrs.
DON'T FORGET THE PROMO CODE WHEN REGISTERING. Terms and Conditions apply.