@lemtrada-uk , I found the following prescription meds which may help – Bethanechol, Doxazosin and Finasteride.
The following is also suggested :-
“Reflex voiding double or triggered reflex voiding. Triggered reflex voiding consists of various stimulation techniques, which include squeezing the glans penis or scrotal skin, pulling the pubic hair, tapping the suprapubic area, stroking the skin of the thigh or sole of the foot, and digital rectal stimulation. If you cannot find your trigger zone, speak to a health-care professional”
Possibly the following is a bit less………erm…… masochistic :-
Your Incontinence Support team may be able to lend you one of these for a trial period.
Hopefully there is something there to help.