I don't know if it is possible to ID these hoverflies just from these shots but it might be. The first 3 are old photos so I don't what dates they were taken, but the first 2 were taken in Norfolk.
Hoverfly 1:
Taken in garden on Brambles.
Hoverfly 2:
Hoverfly 3:
Hoverfly 4:
This one was seen today in Norfolk garden on Brambles, was around 13mm.
Thank you for looking!
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#1 female Eristalis tenax
#2 female, can't really see enough detail but it could be Eristalis arbustorum.
#3 male Eristalis tenax
#4 female Eristalis arbustorum