Hi, thanks for your helpful comments.
For this area marked as cork, I did check some photos of the area and I was trying to apply the best fitting value.  I have been looking at the wiki (https://wiki.openstreetmap.org/wiki/Key:surface?uselang=en) but couldn't find any mention of Cork.

Similarly for the slip way - I was trying to use the values in the drop down so changed "Rails" to "Metal" as Rails was not on the wiki.

For the path that was "partly asphalt" I felt this was less useful than simply "asphalt".  However, I did consider removing the value entirely but felt this would be losing some information.  If this is better practice, I will happily do that.
I'm sorry if I've accidentally degraded the map - it certainly wasn't my intention. I'm still learning the conventions so any guidance is appreciated.
