Info sources: Shortages
See our problem solving page about this subject for more information.
MIMS – has a drug shortages tracker on its home page (subscription needed).
Manufacturers' customer services departments – can clarify details of a shortage and explain any alternative ordering processes in place.
SPS shortages – has notifications and solutions for national shortages. A password protected section of the same site has monthly DHSC updates but you must register with the site using an NHS email address and be logged on before you can see this.
Specialist clinical organisations such as Royal Colleges may offer advice for some shortages (search for them on Google).