https://www.cclonline.com/product/3...B-3000MHz-PC4-24000-CL16-1-35V-Black/RAM4675/ Looks like that RAM is there under a different code, £119 for 32Gb seems a bargain if you don't need maximum performance.
So I've got the 3600 and I've decided on the MSI b550 mortar. I've kindly been loaned 16gb of DDR4 until I can afford a 32gb kit.
Welcome back to the AMD club more like My first build was an Athlon 1333, then a 4600+ upgraded several times to a 5600+ and then a 6000+ (think I had a 6400+ black edition for a short period too) and finally a 955BE on the next build. I still have the motherboards and CPUs apart from the 1333. After that I went 2500K and upgraded that to the current 2600K.