One route is to apply for an NIHR Clinical Doctoral research fellowship, which will pay your salary, research costs and training and development costs. Calls for applicants are released regularly.
The application form is time-consuming to complete so if you might be interested in this route, it is best to start planning your application even before the call. You will need a well-developed proposal and to have identified your institution and supervisors.
If you are successful with your written application, you are asked to attend for interview, at which you will do a presentation. The process is very competitive but there has been recent success by UCLH staff. For more information about the NIHR Clinical Doctoral visit here
Alternatively, you can apply to be funded to study a part-time PhD, professional doctorate or PhD by published work. Talk to a member of the UCLH Education team, about funding possibilities.
You will need to negotiate study time in your area of work. There are external sources of funding available to pay doctoral study fees, for example the Florence Nightingale Foundation Research scholarships, which you can find more information about here