Bet365 will match your first bet (minimum £10) up to a maximum of £200! Not bad if you're confident...
"Open an account, make a deposit of £10* or more and you will be entitled to a 100% bonus on your qualifying deposit up to a maximum of £200*.
Once you open your account we will send you a 10 digit Offer Code ending in NCDB2 via email. To claim your bonus, simply make a qualifying deposit, visit the Enter Offer Code page in Members and enter the code.
To bet with your bonus, simply play through the amount of your deposit once on the sports and markets of your choice. You will need to play through your deposit and bonus three times prior to making a withdrawal."