Yellow Archangel (Lamiastrum galeobdolon)
This plant is more associated with woodlands and heavy soil so its presence here is slightly odd. It does, however, also like calcareous soil. It is widespread in England and flowers in May and June.
This perennial produces flowers in dense whorls on erect stems standing from between 45 to 60 cm. The rich yellow blooms are 17-20mm long with a lip divided into three similar lobes. It has leaves similar to those of the common nettle as they are oval to triangular as well as being toothed. It produces nutlets.
It is part of the dead-nettle family (Lamiaceae).