Repair to roof tile - Roofing (Pitched) job in Hammersmith, West London

Job description

Suspect a slate tile has become dislodged following bad weather and water has been intermittently leaking in when it rains. The property is a typical small London victorian terrace. The leak is in back first floor bedroom, so high ladders required for access. Please advise on availability for possible recce/ and repair. required asap please. Thanks