The business James Sandie has now closed down. It is a private house.

Apparently new housing going in here.
Castle Gardens by Stewart Milne Homes

https://www.stewartmilnehomes.com/new-homes/neighbourhoods/castle-gardens

This house should show as 22 Sycamore Avenue, Port Seton, EH32 0UA

I think the house numbering on the odd-numbered side of Cedar Drive is wrong and there isn't really a number -1. But I'm hundreds of miles away and basing this on Google Street View, so someone more local should ideally go and check.

For consistency, should the `ref` tag be "EGM1", i.e. the ELR? The "046" is the bridge number, and could be included in `other_tags`? This applies to IDs 18482420 and 313660353.

The OSmap on the interent shows the path on the south side of the road extending to the driveway into Bridge Castle. They tell me they cannot change this since it is based on the OpenStreet maps. On your map because of the width of the road the path appear correct. It does not extend across the road onto Bridge Castle Private Driveway. Could the path extension across the public road be removed from the map so that it does not appear across the road on the OS online maps?

Demolition of some buildings here - not sure if everything will be removed

Unable to answer "Does this crossing have an island?" – Crossing With Pedestrian Signals – node/10062245197 via StreetComplete 60.0:

Duplicate crossing.