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Mmm - maybe I need to look at my 'sun spurge' plants again. After checking in a book, I see that crescent-shaped glands are also Petty Spurge features, Sun Spurge has oval glands. Also noticed that there is a Euphorbia peplis (Purple Spurge) as well as E peplus.
Off to the garden to check...
Oh. The plants in my garden are all Petty Spurge. Well, I've learnt something.
Thanks to both kevbert and cicuta (again). Ispot is a really good place to practise and improve id skills.
Lat/Lng: 51.4027393, -0.4620289
OS grid ref: TQ070682