I mean, it did happen under a Conservative government, and Sunak defended his failure to declare an interest by saying that he wasn't privy to his wife's business interests.
It's quite possible that it's that very scandal that prompted Starmer to seek additional guidance.
Yes, we would expect Hamas to say something like that. On the other hand, the Israeli military also said this was not acceptable behaviour.
"This is a serious incident that is not in line with [Israeli army] values and what is expected of [Israeli army] soldiers," the Israeli military said in a statement. "The incident is under review."