There is no minimum monthly spend in the UK market.
There is a minimum bid requirement of £0.05 per click-through. The minimum bid for each click is variable and starts from £0.05. Please note that as the minimum bid depends on the specific search term, certain keywords will have a minimum bid of £0.05 and others a minimum bid of £0.10. You determine how much you spend each month by setting a bid and daily spending limit and you can turn off your advertising and stop your spending at any time.
To activate your ad, you’ll need to deposit funds into your account, which will be used to pay for your initial click charges. Each account requires a non-refundable £60 initial deposit.