There are a few bingo sites that offer a massive free £20 when you register with them and at present I have found 3 bingo sites that have this amount on offer.
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The first is Game village and at this site not only will you receive a free £20 upon registering, but also a maximum of 250% on your first deposit, which is valid for a limited time only. Village bingo offers all players, 5 bingo rooms to choose from which consist of 90 Ball Bingo, speed bingo and a new bingo room called Elimination Bingo in which you must match the least numbers order to stay in the game.
The next site is called Wow Bingo and here you can also get a £20 no deposit bonus which is available if you play bingo from your mobile phone, you can also receive £15 free if you play online. At Wow Bingo you can play 75 or 90 Ball bingo in a selection of rooms which each have a progressive jackpot. The next bingo site is called Blackpool Club bingo and there is £21 free at this site which you can get when you register with them. Once you have done this you will see the choice of bingo games on offer, the promotions and games which can all be played and I think once you do, you will make a first deposit which will also get you a 200% cash bonus up to a maximum deposit of £200. These are some of the sites I found that are offering £20 for just registering and I know I for one will definitely be trying them out.