I'm not sure if you can buy it in the UK as I make my own from flowers I've gathered and dried but Lime/Linden flowers are, in my opinion, by far the best thing for a bedtime tea.
The trees flower profusely in Spring and I gather as much as I can and dry them. Just a small half-handful in a mug with boiling water and steeped for 10 mins is all you need.
They have a very pleasant taste and apparently contain the antioxidants which seem to be so fashionable these days.
If you look up Lime or Linden Tree, you will see the flowers are used for much, much more than as a soporific. 
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sleep tight!
!