Off the credit record radar account

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For years my "main" current account has been with NatWest. Even though I've opened other accounts (Santander, Halifax, tsb) my salary goes in there first before being farmed out to the other accounts. It has a £5000 authorised overdraft which I never actually use.

When I checked my credit reports I realised that it wasn't showing up. My understanding is that this is because it was opened in 1996.

My Santander account has been open 10+ years and I have a credit card of similar vintage so I already have longstanding relationships on the report. My scores are good (for what that's worth )

I'm mulling over options. My original plan had been to switch it to Halifax for the bonus, but is it worth keeping it as a nice chunk of under the radar credit?