I just got a Dell Inspiron 7-something with i5 processor, 8GB of RAM, SSD and a Radeon graphics card for £550.
OP: A £200 (RRP) windows laptop won’t be very good, just like a £200 apple laptop wouldn’t be very good.
If money is tight I’d consider this from the Dell outlet: http://outlet.euro.dell.com/Online/InventorySearch.aspx?c=uk&cs=ukdfh1&l=en&s=dfh&brandid=7&fid=1895
Inspiron 15 – 3567
Processor: Intel® Core™ i3-6006U (Dual Core, 2.00 GHz, 3 MB Cache, 15W)
Windows 10 Home (64bit)
8GB (1x8GB) 2400MHz DDR4 SDRAM Non-ECC
1 TB SATA Hard Drive (5400 RPM)
Admittedly over budgte but ‘only’ £335.
There are some chromebook experts on here who I’m sure will be along soon.
Edit: what do you mean by TV streaming? Wouldn’t a chromecast be better for that?