So, this is almost certainly a worthwhile bonus but I advise checking any details that matter to you with live chat before depositing until the missing terms and conditions have been reinstated.
Worryingly I wasn't able to check my facts on this occasion because the "Bonus Terms and Conditions" page at Buck & Butler currently shows no text whatsoever, only a blank gray area and links to open a selection of their most popular slots. The regular terms and conditions page does open correctly but doesn't contain any details regarding maximum bet sizes, contribution percentages or banned games when playing with a bonus, and the fact that I had no problems playing and withdrawing back when I joined really isn't much for anybody to go on!
I have let the casino support know about this issue and hopefully they will get it resolved so that I can add a little extra detail in a review of their 2nd deposit bonus, but I think the fact that this problem occured at all is serious enough to warrant it being recorded here. Does a player deserve to have their winnings voided based on a term or condition that wasn't actually displayed on the casino's website at the time they played their bonus? Anybody who accepts this bonus today (21/08/2016) would find themselves in just that situation and if they were able to prove the terms and conditions were missing I'd say they would deserve to be paid no matter how they had used their bonus funds.