[2] In 1942 the British Wartime Government introduced a National Savings campaign named "Warship Week" where towns could "adopt" a Royal Navy ship.

In December she was dispatched to reinforce Commander Johnny Walker's U-boat killer group that was escorting convoy HG 76 for passage to Gibraltar.

On 17 December 1942, the German submarine U-131 was spotted on the surface by a Martlet of 802 NAS flying from the escort carrier Audacity and was forced to dive.

As the submarine dived, Blankney achieved firm ASDIC (sonar) contact and made three depth charge attacks.

In July 1942 Blankney was damaged in a collision and spent three months in Northern Russia under repair, before sailing from Archangel as part of the escort of convoy QP 14.

Blankney spent the rest of the year under repair at Loch Ewe with a secondary role to provide a local escort for Convoy JW 51B During Operation Husky.

Blankney was able to provide air defence and shore bombardment at the Bark East Landing area with fellow destroyer, Puckeridge.

On 10 March 1944 Blankney, Blencathra, Brecon, Exmoor and the US destroyer USS Madison, sank U-450 in the western Mediterranean South of Ostia, at position 41°11′N 12°27′E / 41.183°N 12.450°E / 41.183; 12.450, in a co-ordinated depth charge attack.

U-371 lay on the sea-bed at around 240 metres (790 ft) for the rest of the day to evade sonar detection, before the U-boat's commander, was forced to surface and attempt to escape in the darkness.

Following Operation Neptune, Blankney was deployed in and around the English Channel and the North Sea to guard against any attempts for E-Boats or U-boats laying naval mines in the Thames estuary.

Her war was completed when in August 1945, following VJ Day she returned to the UK where she was laid up in Sheerness as part of the Reserve Fleet.