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Impossible to say, it's unlikely you wouldn't be able to get on but if there are any passengers there after the last Island Line service booked to call then an additional service will be requested to stop. You are correct, there is no pedestrian access to/from Smallbrook Junction by road.
We are aware of an issue with emails from the Forum to Microsoft-based email accounts (hotmail/outlook/live.com email addresses). This is being looked into currently, thanks for your patience meanwhile.