This grower is fairly sure of this plant identification.
Free for digging up.
English holly, Christmas holly, Hulver bush, Holly
Ilex aquifolium (English holly). This species will produce evergreen foliage and small berries. They will grow well in rich, acidic soil that is well drained. The leaves are normally spiny dark green, The berries will range in colour from red to creamy white. The leaves are normally spiny and dark green.
Watch out for the thorns.
Hedging. Winter interest. Suitable for coastal conditions.