#1 What is the minimum gap between the N23TA29NO gas hob and either the extractor above or the units above please?
The minimum height from the pan stand to the the extractor should be 650cm. the minimum height for the cupboard units would be 340cm.
#2 In the event of electric power cut, can this hob be used with lighting via matches or lighter ??
You will be able to light with a match in the event o a power failure.
#3 can this gas hob be fitted alongside any of the 80 or 90 cm induction hobs?
This can be fitted to most but not all induction hobs. It's generally suited to hobs which hold a stainless steel frame. These are not compatible with frame-less hobs.