Image editing a priority - UK

Hi folks,

Am looking for a general purpose laptop but with image editing a priority.
Also I'll do a little video editing so probably need separate graphics card.
Screen resolution is a concern; is there MUCH difference between a hi-res 1920x1020 screen or a more standard one? Is the difference obvious? I do appreciate your eyes are different to mine but the question is worth asking.

On a similar note those of you with 17" laptops - do you notice the difference over a 15.4" screen? Would be happy to buy a stand-alone monitor at a later date if laptop screen is too small for intensive work.

Don't really want to spend much over

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