A57(M) and A635(M) confusion

Hello, I was just wondering on whether or not the A635(M) should be referred to in highway_authority_ref=A635(M) whilst the road number would be ref=A57(M). This is because it isn’t signed on the A635(M) on the ground but is referred to as such in official documents.

If anyone could clarify this it would be greatly appreciated!

Kind regards,
AOOSMU

I think the relevant page on CBRD says it all:

So I think your suggestion is appropriate, and it looks as though the ref is wrong on part of that section anyway (between A34 & A6).

Alrighty! I have gone ahead with the change and I have linked it below. Also, thank you for the advice!
https://www.openstreetmap.org/changeset/123697701

Kind regards,
AOOSMU