You can either deposit £25 and get a further £25 bonus (so £50 for your £25). There is also another one where you can get upto £190 on a 20% first deposit sceme.
If you bet, you might as well do it. See what the odds are like and after you’ve used the cash or withdrawn it either delete the account or delete the other accounts you have.
I had about 5 on the go at one point, just use BETFAIR and 365 now, but will give this a go to see if it compares.