I'm afraid it can't be an Ulster, The last Rudge Ulster to have foot change was the 1931 model and the hand change on this tank is a lot different to the Rudge hand change system.
The other give away is the front fork spring had a chrome plated shroud around it and this photo shows a plain spring. The spring on the Rudges had to be in the shroud as they were so narrow, and lacked rigidity that they would bend sideways and not compress under load.
Another thing to notice is the kick start pedal is fixed in the open position, Ulsters had folding kick starts.
Also, at this angle you should be able to see the Smiths speedo and 8 day clock/revulator and the steering damper on a Rudge.
Sorry to disapoint.