Thought I'd throw my 2c into the conversation as I too was faced with needing new tyres on my Ion last year, and contemplating the odd sizes it needs.
The tyres that came on the car were Hankook Kinergy Eco summer tyres, all were getting towards minimum tread, were starting to crack badly on the sidewalls (not a good sign!) and with winter coming I didn't want to be running summer tyres when I rely 100% on the car for the daily commute, and didn't want to try to source a second set of winter wheel rims so I decided to try some All Seasons to use all year round.
After a bit of research and enquiry I settled on the Vredestein Quatrac 5, which are one of the few affordable All Season tyres available in both sizes the car needs in the UK:https://www.mytyres.co.uk/cgi-bin/rshop ... p=R-281206https://www.mytyres.co.uk/cgi-bin/rshop ... p=R-281218
They've now been on the car about 6 months and 6k miles, barely show any signs of wearing in yet and performed admirably through the winter snow and ice. I never got stuck once and I was routinely passing stranded cars (presumably on summer tyres) in the severe snow we had recently in the UK.
Performance in warm dry weather is not as good as the summer tyres that were on the car before, but its close - I'd say dry summer grip is about 80-90% of the original summer tyres, I can notice the grip is less if the car is pushed hard but the difference is small.
I found increasing the tyre pressures to compensate for the softer tyre formulation helped a lot - the manufacturers recommended pressure is 36psi which was OK on the previous summer tyres however I have found that raising these to 40psi in warm weather makes the car feel and handle a lot better, and a lot closer to the summer tyres. In freezing conditions I found about 38 psi was optimal.
Performance in the wet is excellent especially cornering - I don't really notice any significant reduction in grip between dry and wet roads with the grip being very safe and predictable, whereas with the (admittedly worn) summer tyres the grip was better that these in the dry but considerably worse in the wet, so much so that putting your foot down on a wet roundabout invariably caused the rear end to let go and the traction control to go into overdrive to prevent a tailspin - on these tyres there is barely a complaint from the tyres on the same wet roundabout with foot down, with only very mild and controllable oversteer. I put this down to the tyre having a lot of sipes compared to a summer tyre so it is able to clear even deep standing water easily.
So if anyone wants a good all year round tyre that will cope well with a UK winter but still be good enough in summer, I can recommend these, and at £60 each (£55 when I bought mine last year) they are reasonably priced too.
All I would suggest is to run them at higher than normal pressure - around 38-40 psi seems to be optimal, and makes them feel a lot better in summer.
As for "low rolling resistance" - they are not specifically sold as a low rolling resistance tyre, but they actually get a C energy rating on the EU scale, compared to the E rating for the Hankook Kinergy Eco which are specifically sold as a low rolling resistance summer tyre!
(Which you can see here: https://www.mytyres.co.uk/cgi-bin/rshop ... p=R-342565
I've certainly not noticed any reduction in range compared to the old tyres, especially at 40 psi. And when I get home from work in the winter with the heater on with 5 miles of range left, every mile counts for me!