This pub is not only a grade II listed building, it is also a One Star pub on the Campaign for Real Ale’s (CAMRA) National Inventory with an interior of special national historic interest, and the description is as follows: "Despite some modernisation, this pleasant and relaxed pub, tucked away in a quiet side street, still has a good many Victorian features. Outside, don't miss the stunningly prominent iron lamp bracket - it's a good example of a feature often employed at Victorian pubs to advertise their presence. Street lighting was usually poor or non-existent and pub lamps acted like a beacon for prospective customers.

The windows to the main bar have both strikingly large etched panes and some small stained glass panelled details. The entrances are embellished with tiled flooring. Inside, the bar counter is quite an unusual affair with recessed panels, bold ornate brackets and a prominently projecting top tier. The bar-back, however, is modern but in keeping. The walls are largely covered in matchboard panelling above which is a delicate frieze.

A second room on the left has a grey and opal coloured marble fireplace with unusual detailing. The appearance of the main bar is sadly marred by the unfortunate clumsy modern structure placed on top of the bar counter. [NB: This ugly gantry has now been removed, thus greatly improving the servery.] The rear room has probably been brought into use in relatively modern times.

The listing description is as follows: "CITY OF WESTMINSTER WARWICK PLACE, W9 40/11 (north-west side) Nos 1 to 5 (consec) and Warwick Castle Public House. GV II Terrace incorporating public house. Mid C19. Brick, stuccoed. Roof concealed. 3 storeys, 13 bays, the end 2 bays projecting, and additional recessed bay to left. Each house 2 bays. C19 shop/public house pilastered fronts with fascias with dentilled cornice. 12-pane sashes above in architraves. To first floor sills and cornices and pediments on corbels to projecting bays. Scrolled iron lamp and sign brackets to public house. Dentilled cornice."

The WhatPub link is here: WhatPub/Warwick Castle

The Pub heritage Group link is here: PHG/Warwick Castle

The Warwick Castle featured on the Evening Crawl of Maida Vale in May 2002, the Evening Crawl of Maida Vale and Bayswater in December 2005, the Daytime Crawl of NW London and Maida Vale in October 2006, and the Viva Victorian: Evening Crawl of Maida Vale and Maida Hill in December 2012.