Just to follow up on your maintenance requirements, i absolutely understand how this would be important to you.
Unfortunately a maintenance free situation isnt going to happen. There will be a requirement to change water and maintain the filtration. Its not really the case that bigger filtration will reduce the need for maintenance, but more that increasing the number of fish will increase the amount of maintenance you need to do.
When we say a "fully stocked" aquarium what we really mean is that there are enough fish that you need a big (50%) water change every week to keep things stable. I would consider those 12 fish i have in my 57 litre aquarium to be fully stocked. Every week i change about half the water which takes me about 20 minutes. Every month i rinse out the sponge block (using dechlorinated water), and strip down the water pump and give it a bit of a clean, which takes about 40 minutes.
There are measures you can take to reduce the maintenance. Less fish means less waste, and less waste means you can get away with less maintenance. If you where to reduce the fish from the 10 to 15 i recommended down to 6 to 8, you could get away with changing water every 2 or 3 weeks, and doing filter maintenance every couple of months. Plants will help too because they will do some of the work your filter does.
Contrary to common sense a bigger tank is easier than a smaller tank. More water is more forgiving of mistakes because whatever you do wrong will get more diluted. Your £800 budget could run to a 120 litre set up, and those 10 to 15 fish in 120 litres will be less work than the same fish in 60 litres. So that's something to consider if you have room for a bigger tank. There is a Flex 123 that i think would just fit in with your budget. I dont think pets at home sell that one, but you can easily get it online, and there are cheaper options for similar sized aquariums. A fluval roma 125 is a little cheaper and is a very stylish aquarium IMO
. I have the 200 litre version and its rock solid, no problems.
Im a big fan of fluval products. You can pick up their products quite easily, spare parts are readily available should you need them, and lots of people use their products so its a fairly easy to troubleshoot problems. You can get cheaper, but with fluval you are paying a little more for a lot better quality. You can go the other way too obviously, there is better quality at a premium price, but you get value for money with fluval.
You can set things up as maintenance free, one of our members is a big advocate of his no water change set up, but you have to do things a little differently to achieve this and its not something i would recommend for a novice.