I dunno, they're different governments. If we had a labour leader get in (ha!) who had campaigned on giving everyone a £2k check for lockdown when we'd had a £600 one 6 months previous from the cons, I'd expect a £2k check.
I'd be cautious about them changing their mind on the second one after sending the first. But also that isn't the case here and "they" are two different entities.
I dunno, they're different governments. If we had a labour leader get in (ha!) who had campaigned on giving everyone a £2k check for lockdown when we'd had a £600 one 6 months previous from the cons, I'd expect a £2k check.