Is it safe to follow another car that is overtaking a lorry in Northern Ireland?

No. The Highway Code specifically warns drivers not to assume there is space to overtake simply because another vehicle ahead has started to pass.

Rule 164 explains that a long lorry takes more time and distance to overtake. The leading driver may abandon the manoeuvre and need the space you are occupying. Keep back to improve visibility, assess your own safe gap and only begin when you can complete the whole overtake without forcing traffic to brake.