All the same this is a decent second deposit offer which requires you to opt in from "My Account" and make a deposit of £100 in order to receive the maximum bonus. One interesting thing about Mr Smiths bonuses is you are able to select the exact amount of bonus you wish to receive from £10 up to the maximum for the size of your deposit. If your not confident of meeting wagering with a £50 bonus for example you can just choose £20, drastically altering the ratio of your deposit/bonus balances. This wouldn't be useful at a casino that forces you to wager your deposited funds as well as the bonus amount (AskGamblers incorrectly state that on this page, the actual wagering requirement is in fact 35x the bonus only) but some players might consider using this option if they think it will give them a better chance of converting the bonus money into cash. Not me though, I'll take the maximum bonus every time thank you!
The 50 free spins thrown in are only playable on Starburst and have their own wagering requirement attached so I recommend leaving them until you have either made a withdrawal or lost your deposit and bonus - treat them as a second chance essentially, although how much of a "chance" you have with £5 of Starburst spins is debatable!
The game providers really need to man up and start to deal with this problem in software rather than allowing the operators who offer their games to use the lack of such a function as a means of voiding peoples winnings. There's absolutely no reason it couldn't be done and although it isn't a problem exclusive to Mr Smith it's one that desperately needs to be addressed.