If you have a smart TV with internet simply go to IN10SITY.com and sign in and watch via TV or if not connect your TV directly with your laptop/phone with a HDMI cable - (use you existing connections or amazon/ebay £3)

Apple devices: Airplay
Android/Samsung: Smart View / Cast Screen / Airplay

All devices:

Google Chromecast dingle.

Download a cast/mirror/stream app free from the app store/playstore. These will work with all smart tvs. I recommend playto, XCast and Web Video Cast/Browser to TV/+
 

For more details watch this 5 minute Youtube video:
https://youtu.be/KAM1iYhXDu8