This is how it appears in the terms:
" Other examples of irregular game play for bonus play-through requirement purposes include but are not limited to, placing single bets equal to or in excess of 30% or more of the value of your total balance (including any given bonus) until such time as the wagering requirements for that bonus have been met."
The total balance will change with every bet, that's how it works, if you want to go wild with the bonus just keep the bets below 30%, if you win then we pay.
In this case the starting balance was 893.97 GBP not 1000GBP
We will follow LGA recommendations and cap the amount that can be bet per spin rather than a percentage, but a rule is a rule and in this specific case it has been disregarded. As I have pointed out it is not uncommon or unfair, it's just a rule and if you check the terms, or if you ask anyone at support or if you check the FAQ you will get this information as well.
We want to come to settlement to conclude this issue fairly and to demonstrate effective customer care, this will be looked into the PAB.