Amber means it's on the limit? or simply not yet available for resale?
Any estimate that drops below 100Mb is marked as Amber.
I believe they won't sell the service below 100Mb.
I read it was a max of around 350m.
The maximum 350m is line length with 0.5mm copper, even then 350m is on the outer edges.
You may have lower gauge copper, aluminium on the line, or the line takes a long route to the cabinet.
Amber means it's on the limit? or simply not yet available for resale?
I've seen Amber orders progress successfully.
Amber indicates a range of potential issues. In your case it's the low estimates.
I've seen these also progress successfully.
Check your immediate neighbours on both sides and see if their estimates are way above yours. Occasionally there's random database mistakes.
I see the the range is listed as: 6-17Mbps, rather than the 18-19 i'm getting now. I wouldn't mind having 10Mbps up instead of 20, which may be close to reality? What do you think?
If you wouldn't mind halving your upstream for a small increase in downstream then go ahead and order it!
Personally I'd rather have 80/20 than 120/10 but everyone's usage is different.
I'm not a fan of G.Farce. It's essentially only available to those who already receive the full 80/20 and even then some will see a big drop in upstream at the outer edges.