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Mainly just about checking you have sufficient wiring in place (if your current hob plugs in you're probably out of luck) and then looking at the KW ratings. I spent a while looking at this stuff when I was buying mine and find the detailed specs on the manufacturer sites tend to be pretty informative.
I got this one which is 4 zones of pretty hefty power:
https://www.aeg.co.uk/kitchen/cooking/hobs/induction-hob/ike64450fb/
Performance
Left Front - Power/Diameter: 2300/3200W/180x210mm
Left Rear - Power/Diameter: 2300/3200W/180x210mm
Right Front - Power/Diameter: 2300/3200W/180x210mm
Right Rear - Power/Diameter: 2300/3200W/180x210mmor there is something like this where one has more power but some are weaker:
https://www.aeg.co.uk/kitchen/cooking/hobs/induction-hob/ikb64311fb/
Performance
Left Front - Power/Diameter: 2300/3700W/210mm
Left Rear - Power/Diameter: 1800/2800W/180mm
Right Front - Power/Diameter: 1400/2500W/145mm
Right Rear - Power/Diameter: 2300/3200W/170x265mm
Induction hob question
I quite like our Howden kitchen and they basically threw in the Lamona appliances for free.
However the Lamona induction hob is a bit feeble and wondered if there is a brand with a bit more grunt.