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It could equally be Tall Melilot (M.altissima). Did you examine the flowers?
Not closely, but I could easily do on my next walk. What would I be looking for?
Melilotus have several parts to their flowers the standard petal, the wings and the keel. In Melilotus officinalis (Ribbed/Common Melilot) the keel is shorter than the standard and wing petals. In M.altissimus (Tall Melilot) all the petals are more or less the same length. You can also separate these two species by examining the fruits, if present. M.officinalis has wrinkled fruit and is glabrous (no hairs) and M.altissimus's fruit isn't wrinkled and is pubescent (hairy).
Lat/Lng: 50.8757, -0.0165
OS grid ref: TQ396103