1. If I go to Chippenham Station late at night to catch a train and the main building is shut, how do I get onto the platform?
I am directed to the night entrance:

but if I go through there the approach to the footbridge is off limits:

2. If I come off a train and am going to connect onto a bus but don't know my way, how do I find out which of the spaced-out stops I want? A, B or C?

No signs / suggestions - the best I have found is to go over to a random stop and see if my service is from that one ...