I'm certain it's Mb/s not MB/s There is a HUGE difference.
Mb = Megabit
1Mb = 1,000b
MB = Megabyte.
1MB = 1,000B = 8,000b
200Mb = 200,000b
200MB = 200,000B = 1,600,000b = 1.6Gb/s
You're not getting 1.6Gb/s to the house.
Also, can you source because I can't find any info on a speed guarantee.
It sounds like to me, that broadband providers will provide a discount on a hi-speed package that includes a PS4. It isn't ensuring anything, and you still have to purchase something. You don't get it for free.
Because, based on Virgin's comment, it's good for the Xbox One as well.