As well as the bonus £10, you also get 100% on your deposit, but it works very differently to most other casinos – the money is paid out in 10% increments, and you need to wager your deposit 20x to receive the full amount. For example then if you deposit the minimum of £20, you get £20 of pending bonus funds, and each time you wager £40 you will receive a £2 bonus directly into your cash balance. I thought it was strange that despite this arrangement you are still not allowed to request a withdrawal until you have completed the full 20x wagering requirement without forfeiting the remainder of the bonus and any accumulated winnings, but having checked with customer service this is definitely the intended and correct arrangement. Still, 20x is a very reasonable wagering requirement these days so its still not bad deal despite the post-wager setup.
I really think with this kind of post wager bonus you should be free to make a withdrawal at any time and just continue earning the small payments on subsequent visits and deposits if you so wish – I really can’t work out why Video Slots feel the need to do it this way, so whilst I do really like them as a casino, I find it hard to fully recommend their welcome bonus.