Antique Cup and Saucer

I collect antique cup and saucers. I went on a course about Georgian Cups and caught the bug! I pick most up in charity shops and then try and find out what they are! I usually end up sending an email to the teacher of the course asking for help. I knew this cup was old by the shape and handle, but early English cups aren't usually marked. The number on the bottom is the pattern number and the shape is "old english" and it dates about 1830. My expert friend thinks its Coalport.