London Airport Transfer is based at 44 Baker Street you can check google business page with photographs from office and in order to be placed on google business page business has to received cods by postcard!     
https://www.google.co.uk/maps/uv?hl=en&pb=!1s0x48761acdb30b21fd%3A0x73beea30439ef01f!2m22!2m2!1i80!2i80!3m1!2i20!16m16!1b1!2m2!1m1!1e1!2m2!1m1!1e3!2m2!1m1!1e5!2m2!1m1!1e4!2m2!1m1!1e6!3m1!7e115!4shttps%3A%2F%2Fpicasaweb.google.com%2Flh%2Fsredir%3Funame%3D114097486867099939992%26id%3D6401904844250414786%26target%3DPHOTO!5s%20-%20Google%20Search&imagekey=!1e10!2sAF1QipMPOIA0p0ZuRg0gJ4ilarygtJmwBXLSAGi7s6-T