In Lancashire.
I've had Sky Fibre Pro (full 80/20; not interleaved), now on Plusnet Unlimited Fibre (full 80/20; not interleaved) and regularly use a mates BT Infinity 80/20 (full 80/20; not interleaved)
Out of the three, I'd say Sky Fibre Pro had the lowest latency, and had minimal jitter. When I was out of contract for Sky Fibre Pro the minimum latency increased from < 11.5 to 20. So I don't know if it's still like that now because I migrated to Plusnet shortly after that increase.
Also with Plusnet, all their gateways have different latencies (some as high as 20ms minimum, some as low as 11.5ms), so if you want the lower latency you have to keep restarting the PPPoE connection till you find a lower latency gateway. That wasn't the case with Sky, I don't know if it would with BT Infinity, but I wouldn't think so.
Here's two traces to my old server (in Telehouse West) from BT Infinity and my Plusnet connection.
Plusnet:
1 lo0-central10.pcl-ag02.plus.net (195.166.128.183) 13.428 ms 15.051 ms 16.014 ms
2 link-a-central10.pcl-gw01.plus.net (212.159.2.164) 11.710 ms 11.860 ms 11.926 ms
3 xe-10-1-0.pcl-cr01.plus.net (212.159.0.196) 11.146 ms 11.524 ms 11.257 ms
4 ae1.ptw-cr01.plus.net (195.166.129.0) 11.788 ms 11.415 ms 14.450 ms
5 ae1.ptw-cr02.plus.net (195.166.129.2) 11.862 ms 11.316 ms ae2.ptw-cr02.plus.net (195.166.129.5) 16.818 ms
6 gateway-rdns.tld(x.x.x.x) 12.143 ms 12.779 ms 12.368 ms
7 server-rdns.tld (x.x.x.x) 11.840 ms 11.790 ms 11.876 ms
BT Infinity (from WAN interface, not a PC so missing a hop. Sometimes 15ms to that server):
1 217.32.143.35 5.701 ms
2 217.32.143.62 5.788 ms
3 213.120.158.250 8.777 ms
4 213.120.162.69 8.965 ms
5 31.55.165.109 9.707 ms
6 109.159.250.198 9.450 ms
7 109.159.250.156 19.457 ms
8 109.159.254.50 19.729 ms
9 166.49.214.184 18.183 ms
10 82.112.101.73 18.470 ms
11 *
12 x.x.x.x (server) 16.127 ms
I don't have one from Sky to my server, but here's one for comparison.
Tracing route to multiplay.co.uk [85.236.96.26] - 13/08/2013; 13.30
over a maximum of 30 hops:
1 <1 ms <1 ms <1 ms OpenWrt.lan [192.168.1.1]
2 33 ms 14 ms 14 ms 97e70003.skybroadband.com [151.231.0.3]
3 23 ms 23 ms 23 ms 0278098c.bb.sky.com [2.120.9.140]
4 21 ms 23 ms 23 ms 02780a0a.bb.sky.com [2.120.10.10]
5 20 ms 20 ms 20 ms linx1.multiplay.co.uk [195.66.224.224]
6 20 ms 20 ms 20 ms ha01.multiplay.co.uk [85.236.96.26]
And one from my Plusnet connection to multiplay.
traceroute to multiplay.co.uk (85.236.96.26), 64 hops max, 52 byte packets
1 192.168.1.1 (192.168.1.1) 0.428 ms 0.216 ms 0.210 ms
2 lo0-central10.ptw-ag01.plus.net (195.166.128.195) 37.416 ms 38.254 ms 14.552 ms
3 link-a-central10.ptw-gw01.plus.net (212.159.2.144) 12.797 ms 12.558 ms 12.519 ms
4 xe-4-2-0.ptw-cr01.plus.net (212.159.0.240) 12.065 ms 12.805 ms 12.725 ms
5 ae2.ptw-cr02.plus.net (195.166.129.5) 12.747 ms 14.416 ms 12.716 ms
6 195.66.236.224 (195.66.236.224) 13.214 ms 12.794 ms 12.713 ms
7 ha01.multiplay.co.uk (85.236.96.26) 12.524 ms 12.618 ms 12.738 ms
On the speed side of things, Sky Fibre is a bit faster than Plusnet (don't know about BT infinity).
Here's an average speed test from both.
Plusnet:
http://www.speedtest.net/my-result/3442444952
Sky:
http://www.speedtest.net/my-result/2856821941
Conclusion
If I had to choose between either Sky, BT Retail, or Plusnet retail for 80/20 FTTC I'd choose Sky if I knew they had fixed the latency issue (I play, and manage online video game servers). Otherwise I'd go with either BT or Plusnet, I don't know which one as there's really not much difference between them (ignoring BT retails routing), not counting support or other features.
NOTE: BT Infinity connections is on HG612 modem, which adds a few ms to the latency. I'd estimate it at about 12ms without the HG612. Forgot to mention that I sometimes see packet loss in online games and TeamSpeak on Plusnet, never saw it on Sky, maybe it's possible that it's something to do with BT Wholesale, but I'm not sure. Never saw any on Sky.
Edited by gmk (Wed 16-Apr-14 10:33:05)