Saliva Apiana
also known as white sage, bee sage & sacred sage

This evergreen perennial shrub with its silvery light foliage, long leaves and delicate white flowers is heaven for bumble bees!  It'll grow to a height of around 4 feet over time and has a wonderful aroma (its leaves are often used for incense)

Originating in southwest USA, it's popular with wildlife... and is also known to attract humming birds - not sure you'll find many of them over here, but it would be good to help the bees out (they also pollinate it)!

One thing to watch... as the stems are hollow, be careful where you plant it, as they can snap easily.