Being like that is not really a problem, unless they get snagged and dragged. My only objection is that they are unsightly! Maybe get some P-clips and fasten them to te wall.
The Cisco Managed switch - is is rack mounted? If so, you may want to get some shorter patch leads.
Thanks, p clips would be a great way to stop movement of the cables and provide some support - I'm thinking maybe best to mount a sheet of MDF below the 4U rack rather than mounting the p-clips to the brickwork, hopefuly that'll make life a bit easier and thinking beyond that, I could then box in the cables with another sheet to tidy it all up and protect the cables.
As for the Cisco switch, I'm not sure I'll rack mount it as the rack only a little deeper than the switch itself so mounting it would mean it'd push against the cables and having the mains lead for the switch pressed against them so I'll just sit the switch on top of the rack and put the OR VDSL box on top of the switch.
The patch leads are 50cm, are you suggesting I get 30cm ones so that there's less cable sticking out or is there another reason for suggesting shorter leads?