Nuclear submarine heading back to base for more tests

HMS Astute had become stuck during sea trials on Friday in a channel between the island and the Scottish mainland.

The vessel – which is the UK's most powerful attack submarine – remained on view from 8am until the tide turned in the evening when it was freed by a tug.

The Ministry of Defence said checks of the sub's rudder, which is thought to have become stuck on a shingle bank, were carried out in deeper water.

Astute will now return to base at Faslane on the Clyde for further checks. An MoD spokesman said: "Surveys of Astute have now been completed and she will proceed to Faslane under her own power. She is being escorted by tugs and HMS Shoreham."