When changing from a Daily to a Weekly limit or Weekly to Monthly limit, your new limit will come into effect at the end of the previous limit period, as a standard increase would do.

Frequency is taken into consideration even if the overall monetary amount would decrease. For example, if you change from a £500 Monthly Limit to a £50 Daily Limit this will take effect once the current Monthly Limit has ended. Though the amount of money is less overall, it would allow you to increase the regularity of deposits, so this is an increase.