Below I've listed some offers from the main book makers out there.  I only link to book makers I know and trust, so you can trust them too!

The way these offers normally work is that you must bet the 'offer' amount in order to get the 'free' bet.  In other words, if the free bet is £10, then you basically place a bet for £10 and then within a few days you get that amount back.  So it really is a free bet!

Each offer may be slightly different, so make sure you read the small print first!