Hi apeshake,
Just because your bike is 5 years old doesn't necessarily mean that it definitely needs replacing. If you're using the bike a lot then wear & tear does have an impact on the components and they'll only last so long before they need servicing &/or replacing even if you are doing regular cleaning and maintenance.
If you're not happy with the performance of your bike at the moment due to issues with the gears perhaps take it to a local bike shop mechanic that you trust and ask for a quote on what needs doing to the bike before getting the work done if the LBS is happy with that arrangement. That way you'll have a price on the cost of the required work on your bike versus the cost of a new bike and you can weigh up which you think is best for you.
If you do go down the route of the bike then having one with mudguards, a rack, dynamo hub & dynamo lights already fitted because those are all great for a bike that's in regular use or a commuter so if the bikes comes with all of those fitted already then all the better.
If you do want to go down the route of getting a new bike and just want some other options to weigh up against the Genesis Skyline then there are a few options below although some might well be more expensive than the Skyline.
Flat bar bikes:-
Cube Travel
There are quite a lot of different bike models in the Cube Tour / Travel range but several of them come with rack, mudguards and dynamo lights fitted.
https://www.cube.eu/uk/2019/bikes/trekking/tour/
https://www.freeborn.co.uk/cube-travel-sl-2018-black-n-black-hybrid-bike-28395
Kalkhoff Durban
Several of the Kalkhoff Durban models come with rack, mudguards and dynamo lights fitted:-
https://www.kalkhoff-bikes.com/en/bike/urban.html
https://www.bikester.co.uk/kalkhoff-durban-8-city-bike-black-579733.html
VSF Bikes:-
A lot of the VSF bikes have rack, mudguards and dynamo lights fitted and are available with either hub or derailleur gears:-
https://www.fahrradmanufaktur.de/en/katalog/2019
https://www.fahrradmanufaktur.de/en...00-shimano-alfine-11-gang-disc-gates-808-2019
http://blog.chrisbikes.co.uk/2014/02/vsf-fahrrad-manufaktur-t500-alfine-8.html
Drop bar options:-
Genesis Day One Ltd
https://www.genesisbikes.co.uk/bike/day-one-ltd
Bombtrack Bikes
Further to the Genesis above the Bombtrack Arise Tour is another drop bar option and I'm not sure how easy it would be to track down because unfortaunetyl I couldn't see any stockists near Manchester (
https://www.lyon.co.uk/outdoor/bombtrack-uk-stockists ) .
http://bombtrack.com/touring/arise-tour/
One thing to consider is the weight of your new bike because quite a few of the bikes that come with everything included are targeted towards the touring market so it will be worth checking the weights against what your current Boardman weighes. Although that's not necessarily a deal breaker depending on your priorities and for example if the added features/ components with their added convenience are more important than the weight factor but it's something to consider.
If possible a good idea is to get out there and try as many of the bikes that you're considering as possible however that is easier said than done because not many shops stock the sort of fully equipped type of bike that you've suggested.
Good luck with your search.
John