Hi Jial, thanks for your reply.
Yes, when I said UK version, I meant PAL (European) version.
Re the Dreamarena login situation, I do not think I was clear enough in my original sentence so I will try to clarify below. Please accept my apologies for any confusion
If you had a PAL copy of the game and wanted to access the MSR website, you would first need to log into Dreamarena...however this was automatic! On the PAL versions, you can see it says "Connecting to Dream Arena" when you try to go online. This is because the game assumes you had already set up a Dreamarena account. If you did not have a Dreamarena account, then the MSR Internet option would either be grayed out or would not connect when you dial. To make a Dreamarena account, you would have used a Dreamkey 1.0 or 1.5 disc (that came with new Dreamcasts) that was programmed to dial a free phone number that took you to the Dreamarena registration page. Once you have created an account, this information would then be saved internally to your Dreamcast's memory. Once you completed registration, you then could then use the MSR browser to access the relevant pages within Dreamarena. The PAL MSR browser is a modified version of Dreamkey 1.0 (without the registration facility). Technically your DreamPi credentials stored within the DC's internal memory are now substituting for the automatic Dreamarena login.
With regard to the US version, you note it states "Connecting to ISP" when dialing as they were able to choose their own providers from the outset. However the US version also uses a modified version of Dreamkey 1.0 (called Internet Viewer and again minus registration facilities). While you could view some MSR pages outside the Dreamarena wall, the leaderboards and the ability to upload times was contained within Dreamarena itself. However I do not know exactly how US users gained access; were they required to create some kind of Dreamarena account or were they given some kind of special access where Dreamarena automatically recognised them as US based and just let them in? I know the "authenticate.dream-key.com" URL pops up when you browse some of the US MSR pages on the Wayback machine.
The main URL is the same for both PAL and US versions (metropolis.dream-key.com). I doubt Seganet had any involvement with MSR at all (that was a monthly subscription service for online gaming in the US. MSR only had online features).
Basically anything involving Dreamcast online in Europe went via Dreamarena in some way. This continued until early 2002 when Dreamarena closed and Dreamkey 3.0 was released (which allowed European users to choose their own ISP)
The "ringcode" I am referring to is actually on the back of the GD-ROM itself. It's located just by the disc hole (the serial number). Here are the codes for the 3 PAL versions:
MK-51022-0146SS: v1.001 (10.10.2000)
MK-51022-0146SA: v1.002 (10/20/2000)
MK-51022-0146SB: v1.009 (11/21/2000) **final PAL revision**
Taken from: https://www.sega-dc.de/dreamcast/Metropolis_Street_Racer
The demos can be found by going into the Options menus. While it is just footage of CPU cars, you can see how the replay option may have looked if it was implemented (there are no replays in any version of the game).