This weevil Pseudapion rufirostre  from the family of Straight-snouted weevils (BRENTIDAE) is a permanent resident in the garden and can be found there in larger numbers on Common mallow (Malva sylvestris).
It is a male based on the orange forecoxae and bicolored snout .
They feed on the plant juices together with other weevil species present on the plant which results in typical marks shaped like brown circles, like the one visible in the photo. Eventually the whole plant will be covered with these spots.
References1 Nederlands Soortenregister
2 UK Beetles