A few days ago after the appalling attack in Manchester, James Heappey wrote me a campaign email:

"Campaigning resumes at midday today after pausing for a few days to reflect on the horrendous attack in Manchester. The tone of the campaign ... will hopefully continue to be respectful over the next week" [my emphasis]

My reply:

So where does “Why don't you fuck off back to Scotland?” fit into that plan?

To explain:

When meeting the sixth form at Millfield school in Street, Somerset, Heappey asked pupils how they would vote in the proposed second Scottish independence referendum. A Scottish girl said she would support independence. Most reports assert that Heappey then asked her "Why don’t you fuck off back to Scotland?"

A good starting point to read the many reports is Heappey's page on Wikipedia.