Johnnycolt - the S23's are in the FSX section. There are two packages Part 1 and Part 2. (I included my flying boat scenery as well but not a lot of the libraries - see the notes on where to find them). They work without any issue in P3DV5 but there is no addon xml for them. If you want I can make one up for you and post it here if you need it. These two packages cover all the Marks of the S23, basically the changes were in the tanks fitted and it was almost the case that each one produced got a slightly different tank system. The S30 is the same hull but different engines that is all. There are two critical mods a flap warning system and cabin-crew intercom alert system which all the S23's had. The sound package that comes with these is of genuine Pegasus engine sounds that I reworked for to allow for 4 engines - it is distinctively different to your standard pratt and whiiney radial sound. There is detailed documentation included for those interest including how to fly a flying boat on the water and generally. This information is based upon original source documents from the UK and elsewhere (including some pilot accounts) of how to handle and fly these aeroplanes. I will confess the S23 is my favourite aeroplane - its performance is remarkable it is basically STOL which is impressive given it is a big heavy 4 engine flying boat. Shorts knew how to design and build flying boats better than anyone actually!
Here are the links for the S23:
SHORT S23 UPGRADE PACKAGE PART 1.zip (sim-outhouse.com)
SHORT S23 UPGRADE PACKAGE PART 2.zip (sim-outhouse.com)
The Lazrus's version (at SimAviation) - this retained the original JBK interior and panels etc and cover none of my mods. No reason if you want to alias across my panels into these but the config files are very different due to Lazaruses mods they do not cover the tanks engine power and other little things. They fly the same basically!. If you do a search at Simaviation.com in P3D using the term Sunderland it will bring up Lazarus's Solents, Sandringham, and Sunderland packages - you want the ones marked FSX/P3D not the earlier ones. These all retain the earlier JBK panels and gauges. The solent was always very accurate so there is no need to alter it the Sandringham was not which is why I redid and used the Anseet Sandringham Beachcomber as the guide on the panel which is different. I will release this one because it is good to go.
If you do a search of the same site using the term Shorts it will bring those ones up and the Hythe, S23 and the Singapore. These are all Lazrus versions. I think Lazarus has nailed the planing take off issue correctly but there are issues with the model (the throttles are mismatched in the core model so 1 is 2 2is 3 and 3 is 1 if you get my drift - we fixed this but have not released it. There is a panel mod for it in the Other - look for Short S8 modified in the Warbirds Libaray FSX Other.
I will work on a Sandringham release ( I will talk to Lazarus see if we can do a blend of his and mine) keep you posted in due course. And the same for the Sunderland MKV which as some extra paint jobs in it now (French Aeronavale and RAF.