|From MIDMARSH JOTTINGS|
It appears to be an example of lilioceris lilii (the Red Lily Beetle) which is very destructive to many bulbous lily plants as both the adults and larvae feed on the leaves, flowers and stems of the plant. At one time they were confined to the south of England but with the rise in average temperatures they have spread northwards. Certainly it was not very far away from one of my containers which is planted with lilies.
If your lilies are being attacked by these pretty little beetles then it may be worth looking at Down Garden Services web site where more detailed information about them can be found.
I gave my lily plants the once over and have not detected any eggs or larvae so far so the pest may have only arrived recently in my garden.