A massive variety of crap, mostly. The only thing that gets close to well connected countries in Europe is BT's Infinity. The rest are just pathetic ADSL offers or throttled-to-hell cable offers (Virgin, now UPC).
http://www.sky.com/shop/broadband-talk/fibre-optic/ https://sales.talktalk.co.uk/product/fibre http://www.plus.net/home-broadband/package-guides/fibre-opti...
BT Retail has just been really good at advertising it, the rest of the ISPs don't seem to have branding budgets to compete.