I think it's an abject failure in British policy. I think that the opposition has already pledged, as a priority, that it will prescribe the IRGC as a terrorist organization.
In Britain, there was a visible disagreement between the Home Office and the Foreign Office. The Home Office was in favour of proscribing the IRGC, and rightly so, because first and foremost, the proscription of the IRGC is an interior ministry issue. It is about British national security and the protection of British citizens. Unfortunately, the Foreign Office opposed the move and was able to block it.
However, there is hope with the opposition party, which is predicted to win the election. Of course, we can't predict elections, but the polling shows that. The opposition party has pledged that it will proscribe the IRGC as an immediate foreign policy priority and domestic security issue.