The Iran Embassy in the United Kingdom has posted on their Telegram account a call to Persians living in the UK.
A campaign called Jan Fada which translates to "devotion" or "sacrificing one's life." The message appeared to encourage expatriates to stand up for Iran and even become "martyrs" if needed.
In my eyes, that message constitutes grounds for breaking off diplomatic relations with Iran. PM Starmer is too timid to declare the embassy staff persona non grata, and close the UK embassy in Tehran.