?

I have been gifted 2 Wheeler and Wilson No 9/D9 ? machines about which I know absolutely nothing. They came with 1 needle and one shuttle bobbin between them.? The round headed needle has a groove running the length of it and fits into one of the machines but has too large a shank to fit into the other one.? Both seem to have built in bobbin cases with a latch for removal of the bobbin.

One has the Serial No:?2277760?and the other has the serial number?2559291.?
I live in UK and would dearly love to be able to use one or both of these machines, value is immaterial as I intend to keep them when and if I can get the needles/bobbins I need.?
If anyone can help with information on needle size or alternatives and where I can buy these or the bobbins I would be most grateful.
Any further help or information such as age etc would be most appreciated.
Waiting hopefully
Linda