Try http://www.elementman.com
Replacement halogen elements HH52 at 1800 watts and 200mm diameter. Price £55-50.
I have the same hob as you. The metal element around the inside of the smaller halogen hotplate on mine has burnt out. I’m drawing a blank in replacing it at the moment… but if you’re about to throw your 260 away…. otherwise I’ll probably try to fit a HH51 replacement from the same site.
There was a Belling hob element on http://www.cooker-parts.co.uk part number
PMBELHU2030 Price £145-00. This might be the part you’re after?
regards
Nigel Shaw