Ononis species like chalk and coastal areas and tend to be pink or yellow.
Spiny restharrow – Ononis spinosa
I spotted this in Kent thanks to a handy sign at South Swale nature reserve. It grows to about 40cm with pink pea flowers and long spines on a hairy stem.
Common Restharrow – Ononis repens
Common restharrow grows near me in Seaford. It is a chalk grassland indicator species. The obvious difference from the above species is the lack of spines. I think Spiny restharrow has brighter pink flowers than Common and is more upright.
External link to brc Ononis atlas