Open account and deposit £150.
You will then be credited with £150 bonus.
Your cash will be converted to bonus as well.
Bonus needs to be wagered 35x.
Load Blood Suckers slot and set lines to max and stake to min.
Blood Suckers only counts 75% towards wagering so you will have to wager £1312.50.
The average profit is £18.75
Go to My Account and Active Bonuses it will show the remaining wagering needed.
Terms and conditions here.