Brixton exchange - migrating from AOL - speeds?

[BrixtonBiker]

After "AOL" (aka TalkTalk) subjected me to yet another period of disconnection last night, followed by a lengthy discussion with a chap in Delhi and then them asking me to phone back this morning when L2 support was open again, THEN followed by a miraculous recovery of my service, I decided I was sick of the unreliable service, and that it was time to make the change - and have ordered Sky unlimited. (A good excuse to place an order for HD at the same time!)
I am provisioned for up to 8meg on AOL, and *usually* get around ~6meg, although I seem to be getting ~4.5 down and ~0.4 up at the moment :/
Sky's automagic doodaa thinks I'll get around 5.5meg on Sky - but if they're provisioning for up to 20, should I not get something a bit faster than that?
My line stats as they are on AOL at the moment are below. I'd like to get anyone's wisdom on this, to manage my expectations realistically! Also to know whether to nudge Sky to adjust settings if the line settles at a slower speed than what I enjoy at the moment.

Oh - excuse this being in a "code" quote, but it's the only way I could spot to easily format the table! Don't see a [PRE] type alternative!

Port    Status   TxPkts  RxPkts  Collisions Tx B/s  Rx B/s  Up Time
WAN     PPPoE    2685534 3409534 0          2257    4725    23:37:06
LAN     10M/100M 72815   2723    0          108     4       24:41:10
WLAN    11M/54M  95456   90432   0          3528    1180    05:07:55
							
ADSL Link	     Downstream Upstream					
Connection Speed     8192 kbps  448 kbps					
Line Attenuation     31 db      9.5 db					
Noise Margin         10 db      29 db

Many thanks in advance for any help you can offer.
I'm seriously impressed with the level of knowledge you guys have here, and how helpful you all seem!
Cheers
David

[IWasNotTheEnemy]

Another meg or so, give or take...upstream will be at least double what it is now though

[simonmpoulton]

Providing you have proper internal wiring I reckon you'll be getting 10-13mbps. Maybe even higher your attenuation is pretty good.

[BrixtonBiker]

Providing you have proper internal wiring I reckon you'll be getting 10-13mbps. Maybe even higher your attenuation is pretty good.

That would be fantastic... my modem is plugged directly into the master socket faceplate thingy - I don't use the separate splitters.
(Not going to get my hopes up, though!)