" INternal Tv Tuners"?

Sorry I do't know where to buy it in the UK. But the most common are PCI tuners. Its eay to install by inserting it to the PCI slot in your computer(most motherboard has PCI slots). So verify if your PC has vacant PCI slot,and with the aid of installation manual and should come with a CD..then installing it should be ok. You just have to insert in in the PCI slot and run the installation CD or sometimes CD first so that drivers will be readily available and windows can identify the tuner,and its done...As for the reception. its the same thing you do, connecting the antenna, positioning the antenna..But if there are variety of brands available, usually the one that cost more is better and has better recepion. Its just like playing DVD's. And the installation CD will install the tuner softaware, you just have to click and scan available channels.