Whatever happens, some people are going to lose out. (I don't mean that callously, BTW, just it's a fact with the difference in latitude between the Shetlands and the Channel Islands.)
It would be disastrous for businesses for Scotland to have a different time zone, as has been suggested in the past.
Just as an exercise, I've worked out that, for December and early January, it wouldn't be daylight until 9.30am on GMT +1. On GMT, our daylight hours are roughly 8.30am to 4.15pm. This is only about 45 minutes difference from when I lived just north of Leeds. By the same token around the summer solstice (and assuming a clear night), it gets too dark to see at about midnight and gets light from about 3.30am. ON GMT +2 that means it would still be light up until 2.00am. Great if you're having a party; decidedly not great if you want the kids in bed and/or need to get up for work the next day! Actually, a lot of our visitors at that time of year think the long light evenings are great, until they want to sleep and are disconcerted by it being so light very early in the mornings. (We won't mention the dawn chorus!!)