Any wagering requirement up to 35x the bonus sum can be considered low, compared to the vast majority of online casinos. However, there are still differences within this niche.
A 5x wagering requirement for the bonus is extremely low. Since completing the wagering is so easy, the bonus sums tend to be quite low, rarely surpassing £20. In addition, there are not many new UK casinos with wagering requirements this low.
A bonus with a really low wagering requirement may consist solely of casino free spins instead of bonus money.
A 40x wagering requirement gives you much more options when it comes to the range of casinos and bonus sums. You can get hundreds of pounds worth of bonuses with fairly easy wagering. Just pick just the sort of casino you like to play in.