The RAF had USAS (latterly USAS 2), which was chosen as the basis of the development of a Tri Service IT system (including elements of the other Logistic IT systems in use by the MOD). The underlying database for MJDI has just been moved to Oracle 12c and I am not aware of any replacement (or any MOD requirement for a replacement) for MJDI at present.
I used USAS 2 in the 80's it was pretty advanced at the time compared to the systems that civvy's were using. I don't recall anyone complaining that it wasn't any good or lacked functionality (apart from POL batch numbers/expiry dates).
Even the previous system could do text messaging with **D and **P which was really useful (as well a being abused a fair amount).