He was born in Torquay, the son of the Congregationalist minister William Garrett Horder.

The Horder family lived at 6 (now 18) Hamilton Terrace, St John’s Wood and his daughter Barbara Morley Horder (1898–1986) became a noted actress.

In 1927 Morley Horder acquired the Court House at East Meon in Hampshire.
This was a country residence of the bishops of Winchester.
It was in a badly dilapidated state and he set about restoring the building.
 Of this residence, the great hall, a solar, and a garderobe block survive largely intact.
The Court House is remarkable for its fine state of preservation.
It was commissioned by the bishop, William of Wykeham  and built by his master mason William Wynford, one of the greatest of 14th-century architects, who remodelled the nave of Winchester Cathedral and designed Winchester College and New College, Oxford.
 Morley Horder added a north wing, joining the medieval house to the 18th century thatched cottage on the roadside, and he laid out the gardens between the house and the 18th century thatched barn on what had become a farmyard.
Morley Horder also bought and restored a number of thatched cottages in the village.
An account of Morley Horder's restoration work is given in a Country Life article.

Horder appears to have been eccentric, with a domineering character: "To his pupils he was "Holy Murder" (a Spoonerism on his name); according to his daughter, "he was most charming... and most awful"... "pushing artistic temperament to its limits, [he] looked and behaved like a cantankerous Old Testament prophet."
He was born in Torquay, the son of the Congregationalist minister William Garrett Horder.
The Horder family lived at 6 (now 18) Hamilton Terrace, St John’s Wood and his daughter Barbara Morley Horder (1898–1986) became a noted actress.
In 1927 Morley Horder acquired the Court House at East Meon in Hampshire. This was a country residence of the bishops of Winchester. It was in a badly dilapidated state and he set about restoring the building.  Of this residence, the great hall, a solar, and a garderobe block survive largely intact. The Court House is remarkable for its fine state of preservation. It was commissioned by the bishop, William of Wykeham  and built by his master mason William Wynford, one of the greatest of 14th-century architects, who remodelled the nave of Winchester Cathedral and designed Winchester College and New College, Oxford.  Morley Horder added a north wing, joining the medieval house to the 18th century thatched cottage on the roadside, and he laid out the gardens between the house and the 18th century thatched barn on what had become a farmyard. Morley Horder also bought and restored a number of thatched cottages in the village. An account of Morley Horder's restoration work is given in a Country Life article.
Horder appears to have been eccentric, with a domineering character: "To his pupils he was "Holy Murder" (a Spoonerism on his name); according to his daughter, "he was most charming... and most awful"... "pushing artistic temperament to its limits, [he] looked and behaved like a cantankerous Old Testament prophet."
Percy Richard Morley Horder