The 8GB Ram/ 256GB storage does not seem to be available for S7 or S7 Plus in the UK at the moment anyway, though different in other markets. https://www.samsung.com/uk/tablets/galaxy-tab-s7-4g-t875/SM-T875NZNAEUA/buy/
Customers though have the external storage option of up to 1TB with the use of a Micro SD card.
Tab S7 Plus video review here:
Real big shame that Samsung is not making the 8GB ram version available in the UK. I'd have pre ordered straight away. I had been holding off getting a new ipad as I was waiting for the new S7. Was very happy to see 8Gb ram announced in their event but as it is not available I don't see any point in getting an android tablet. Apple offer 6Gb ram on their pro model