i am looking for a laptop for £250 which will be used for streaming, downloading and and browsing.
i am looking for 500gb 4gb to 8gb ram. has to have at least two usb connection. bluetooth is optional. dual core.
Given that mainstream dual cores only just start at £250 your choices are fairly plain. I think there are a couple of Broadwell Pentium (3805U/3825U) models around as well as some of the previous generation Haswell i3-4000s. Skylake Pentium 4405Us aren't at that price yet, and Skylake Celerons don't seem to be on the market yet.
I thought you were after a dual core processor? The A4-5000 is slower.
The 255 G4 only appears to get AMD's low power processors rather than the mainstream ones, so the 3825U 250 G4 configuration is probably preferable in that laptop. HP don't generally make major changes between revisions of chassis, so it should be similar to the 250/255 G3.