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There's standard broadband through copper which is available in most places but is slow.
There's the fibre to cabinet which seems to be open to all companies (but isn't installed everywhere) but isn't that fast.
There's Virgin's fibre which seems to be restricted to them (and not at all properties) which is fast.
In London there are random other ones (often restricted to fairly specific geographic locations). If you're in a block of flats, particularly pretty modern, there may be a specific provider for the flats.
Stick the postcode into a few supplier websites to see what you can get.
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We have fibre to the home that isn't virgin.
Well... I assume we do!; it's not delivered in to our property by phone line, as I understand it, the new bundle of pipes running up the side of the building are actual optic fibres...
Seems blazing fast and £20 a month.
Virgin also did / does 'cable' which is some kind of fibre or wire to the home.
That's one of the things I have no idea about - theoretically one would assume that if you're cabled up for fibre anyone could send the signal through, but in actual fact I have 0 experience with whether it's actually handled that way...