From the Historic England entry:
“Included as a remarkably complete late example of the corporate style established in the early 1900s by Leslie Green for the London Electric Railway. This is a particularly sophisticated and lavish example.
London Underground Station. 1914-15, probably by Stanley Heaps, but retaining the distinctive house style established by his predecessor Leslie Green for the London Electric Railway. Red glazed faience. Single storey surface building with flat roof. Six bay frontage to Cambridge Avenue, with two-bay return to Alpha Place. Each bay contains a round-arched opening, those at either end of the Cambridge Avenue facade being entrances to the station, that to the right with blue canopy. The two bays immediately to the right of the other entrance retain their original tripartite fenestration, found in the top lights elsewhere, and small-paned glazing. This forms a lattice pattern which is repeated under the windows. Between each window the faience-clad pilasters repeat the round-arched motif. Above them is a tiled frieze set into the faience: over each bay is respectively “EXIT”, “UndergrounD”, “KILBURN”, “PARK”, UndergrounD” and “ENTRANCE”, and a dentiled cornice. This pattern, with “KILBURN” and “PARK” is repeated on the Alpha Place elevation.”