Radio:
Failed to download schedule page: https://www.bbc.co.uk/schedules/p00fzl8f/2018/w46

Looking for ideas on how you over-ride this

You can't because that service ended on 31st July 2018. What version of GIP are you using, IIRC that was amended in a GIP update.

There was a fix for the Highlands and Islands schedule in version 3.17

Yes.

From the Release Notes (https://github.com/get-iplayer/get_iplay...release317):

"Removed BBC Radio Highlands and Islands schedule URLs (no longer available) from programme indexing. This will prevent unnecessary error messages during refresh."