I think you'll find the front fork is, as Graeme suggested, BSA. The give-away is that the fork is in one piece even though there are no spindles. The BSA fork design had the bushes attached to the fork links, so the only role of the spindles was to take up side play and stop the links falling onto the road. I reckon "own make" might be a good description of the rest of the frame. Interesting and worth saving.