Shoulda read your sig . So long as you dont try to get too exotic with your coral selection and so long as you don't try to over-stock your tank you can get by without a sump. Installing a small sump in the 10-20g range (which is about all you could fit in that stand) wouldn't really be all that worth it. Going sump-less is likely the best of ideas for someone in your situation, just remember that you'll struggle with corals that love super-clean water like SPS. If either over-stocking or keeping SPS corals is important to you, then I'd still go with a sump, but if neither of those is important to you, go sump-less. I know N1Z doesnt use a sump on his 55g with mostly softies and a couple LPS and his tank does great. If you keep on-top of your water changes, gravel vac often, have sufficient surface flow/ripple, and stock modestly you can totally do it.
Having said all that, definitely get that tank, its a steal and a half at probably anything under 600 GBP
Having said all that, definitely get that tank, its a steal and a half at probably anything under 600 GBP