A few things to note - They ask for a short synopsis. You may submit by post (send an sae if you'd like your manuscript back) or email. And this, "All successful submissions are accepted on an All Rights basis that gives Bauer Media exclusive copyright." (applies to fiction only)
If you sell exclusive copyright the story is no longer yours. You can't offer it to anyone else. You can't publish it yourself anywhere, not even on your blog. You can't enter it into a competition. In the unlikely event it's made into a Hollywood blockbuster you'll get nothing.
It's your decision of course, but since I've been aware they take all rights, I've not subbed them anything.
The cake isn't yours - it's all mine!