I was unsure of a black hob on white worktop however since my units are carbon/graphite it does help it blend in better. I do think if I had all light units it would make the hob stand out perhaps too much! Sorry, not the pic of a white hob....... I have never actually saw a white hob!

@Owen Train You said in your original post that you have 2x standard plug sockets in the island so i assumed you want to use those, without looking at your electrics i 'assume' that these are on a ring already from the fuseboard and has 2.5mm cable, so you could use these with the appliances that i'd stated. For a 'hard wired' induction hob these are more powerful and needs a minimum of 6mm cable coming from its own dedicated 32amp breaker/fuse in the fuseboard and this would suit a 7.5kwatt hob. Most single ovens run at about 3kwatts so these can be plugged (there is a rating plate in the oven somewhere), the induction hobs that come with plugs fitted also run at about 3kwatts and so can be plugged. Now if your existing sockets on the island will need to be moved/broken into altered in any way (you can change face plates but thats about all) this then comes under Part P of building regs as kitchens are considered high risk areas (and i've seen plenty of dodgy wiring in them to agree) and the work needs to be carried out by a 'competant' person (certified part p electrician) who can then test and inspect the work done as a minor works and notify building control so the work is recorded. If you want to run a new supply from your fuseboard that also comes under Part P but is considered major works which may mean a lot more testing of all your house electrics. The electrician is also responsible for Part F compliance which covers extraction and ventilation and by removing a ducted extractor in an existing kitchen you are making the ventilation worse, so thats why you need something like a bathroom fan but it should be at least 60 litres/sec as its not over the hob. Your existing appliances you say are connected to junction boxes under the sink (I assume you mean just a junction box and not a switch spur or anything) and are on the 'kitchen ring' now these should have a means of isolation (ie a switch or just a fuse) looking at your photo you have a couple of switches to the right of your hob, these look like switch fuse spurs and i imagine either one controls the oven and the other controls the ignitor for the hob, or one does the oven and hob and the other is the extractor, both are fine, so the junction boxes are fused down and fed from the switch fused spurs. As your kitchen is only a few years old, part P has been about for a long time now so you should have an electrical report for the previous work, dig that out, have look on line at various hobs you like and get the details (ie how many watts or kilowatts required) and get 3 electricians to quote you for the works that you want doing, and then decide if its worth doing, also don't forget you'll also get another bill from your gas man for disconnecting and capping off you gas hob to factor in.

I don't think it would be that noticeable that the hood is slightly narrower than your range. I would also consider how often and what sort of food you like to cook. If you are more of an oven user then I don't think a slightly narrower hood is a dealbreaker. It's a good looking hood, the new one. If you do a lot of stirfrys and open pan stuff then I think you need at least the same size as the hob. I'm just curious as to why a kitchen designer would advise a narrower hood? Is there a big cost difference? Once you have an upstand or a backsplash you would hardly notice it was narrower and there are some very ornate extractor's which look more like light fittings and are not the same width as the hob. Could you view some examples in a showroom to help you with your decision?

I have had 2 Smeg range cookers. As stated above by Jonathan put a pan on it with water or butter or something in it, not empty. Have you looked up the error code online? I would call them, it's brand new. If you cannot shift it from that state then it's faulty and should be replaced.