All right so sky is the best.
You can sign up online http://www.sky.com/products/broadband-talk/broadband...
or call them they may be able to arrange for a new phone line (or to take over the old one) - in the UK you must have a phone line to get broadband (unless you go with Virgin Media - more about that later).
All phone lines are owned by a division of BT (called 'Openreach') your teleco (which may be BT's retail division, Sky, or a number of others) then leases the line and the broadband equipment from Openreach.
You won't have a contract with Openreach, just with your chosen provider and so far as 'FTTC' goes (fibre to the local BT green cabinet, then traditional copper/aluminium phone lines to the premises) the best of the bunch seem to be Sky, BT Retail and probably Plusnet, although you'll likely suffer less p2p throttling with Sky.
I have also done the test inputting my postcode on the virgin site (just to see what happened) and it said I was covered by the 100Mb. Does that mean that I can use sky at the same speed?
No; Sky uses BT Openreach FTTC/VDSL products so is limited to 80Mbps down / 20Mbps up (although I understand you first get switched on with a 40/10 product then Sky manually switch you to 80/20 if you call them).
Virgin Media (in cable TV areas) use their own infrastructure, which is a combination of fibre and co-ax copper cables. Nobody else uses their infrastructure so the only way you can get 100Mbps broadband via the Virgin Cable TV feed is if you get a cable TV, phone and broadband package direct from Virgin (although I believe Virgin now offer a broadband only package for £35 a month (no TV, no phone) or £42 a month if you want 100Mbps plus phone line rental plus a calls package, then they have their top "VIP" package, which is 100Mbps broadband, phone line, phone calls (unlimited UK landline calls - mobiles and international calls are extra), plus Tivo and about 200 TV channels, for £99 a month!!!
The equivalent Sky package (phone line, calls, 80Mbps broadband, Sky's HD PVR and around 400 TV channels including sports & movies, plus their HD package) is pretty much the same price at £100.50/month - or £1206 a year!!!).
Also I have read a lot of good reviews about Xilo, how is that ISP?
I know very little about them.
Just a word of warning (and it may be so in other countries, too) but broadband in the UK is a bit of a mine-field.
Providers often make wild claims about "unlimited" products but then hide "limits" or something called "fair usage policy" deep in their terms & conditions, so all is often not what it seems (and just going by price isn't always an indicator - there are plenty of expensive providers which charge an arm and a leg for very low monthly allowances but you may well get a better service than a cheaper one which claims to be "unlimited").
The UK telecoms regulator (Ofcom) is largely toothless and its bark is definitely worse than its bite.
Every so often they pull an ISP up on claims (normally related to the advertised speeds more than anything else).
So long as an ISP which claims to be "unlimited" doesn't prevent you from downloading once you've reached a level set out in the FUP or terms & conditions, Ofcom seem disinterested (at best).
So the more shady companies (and they include some of the big players and big names - including Talk-Talk for practically everything, BT for peak-time p2p, amongst others) have worked out a system where they limit the download speed on certain protocols (e.g. p2p - some even cap Usenet speeds), rather than simply cut you off when you reach a limit on the "unlimited" package.
The ISPs claim they're still providing an unlimited product. Because they don't stop heavy users from downloading full-stop, and only limit the download speed, the ISPs claim they're still giving you unlimited downloads.
Many users may take "unlimited" to mean you can download at your connection speed 24/7 all month and not get limited.
Unfortunately the ISPs don't agree.
Even BT and Sky have FUP limits on their "unlimited" products, although I've never heard of any customer actually being pulled up on it.
But the FUPs are there, none the less, and all ISPs have wording such as "if you regularly go over an imaginary (and as yet made up) maximum monthly limit, we may reduce your speed and repeat offenders may be cut-off and have their contracts terminated" (or words to that effect).
Virgin are known to have very active capping & speed limiting in place, so despite the 100Mbps claim (they even say "Unlimited downloads – no caps no hidden charges") Virgin have very strict traffic management policies.
For example (something I just pulled from a Google search), the 100Mbps "unlimited" product has a daytime period of 10am to 3pm.
If, within these hours you download more than 20GB in one daytime period (easily possible, given a 100Mbps connection can download 20GB in about 30 minutes), they cap your speed by 50% for five hours.
Virgin then have an even stricter "evening" period between 4pm and 10pm.
During these hours, if you download more than 10GB in one evening period they cap your speed by 50% for five hours.
Only 10pm to 10am is allegedly un-throttled.
Effectively Virgin Media's traffic management policy limits a total monthly download (between 10am & 10pm) to 900GB if you want to avoid your speed dropping by half (no apparent limits outside of these hours).
However; it's not so much the total amount (900GB should be enough for anyone), it's the fact that you have to restrict your 10am to 10pm downloads to no more than 30GB a day if you want to avoid losing half your speed.
BT are better (except for p2p use there appears to be no throttling at all and very little evidence of lack of capacity).
Sky are even better (very little evidence of throttling of any kind).
So for heavy users I feel Virgin Media are best avoided like the plague.
Bit wordy, but I hope this helps
vDSL2 FTTC Infinity with BT
DL Sync 80Mbps
UL Sync 20Mbps
Edited by adebov (Sat 19-Jan-13 00:36:06)