The house that Luther was living in at during his leave is located at Seven Sisters, between Eastbourne & Seaford in East Sussex, England.
This area location has also appeared in Robin Hood, Prince of Thieves, Harry Potter & the Goblet of Fire & numerous art works.
The house in the beginning, where Luther lives, is the same house Charlotte Rampling lived in as a lawyer, in the series 'Broadchurch'. The beach and cliffs one sees from the windows are exactly the main scenery from Broadchurch.
As Luther stares out over the white cliffs, the lighthouse just off the coast of Beachyhead can be seen in the distance.
The house at the start was use in The Bill S21 E43 (316).