There is lots of advice on the radio about this recently: basic advice – this is probably useless – but travel agents that are on the verge of going bust tend to sell deals that are too good to be true to try and stay above water.
Sadly – usually – you’ll never get on a plane to get any benefit from the abta / atol stuff. Worst case is you’ll be stuck at Gatwick / Preswick etc. You’ll just not get to go anywhere and have a beef with your credit card company til they settle up (if you’re lucky and used your credit card). By the time you get the money back the kids holidays are over and its all pointless.
Anyway, if its too good to be true, well, you know.