mytyres website, sell the tyres in the size 185/60/R15 for your Jazz,
Disregarding those budget Chinese brands which are very cheap (best avoided).
There are several well-known brands in the £50 to £60 price bracket, names such as Toyo, Avon, Barum.
Avon is a famous name,. OEM for Rolls-Royce cars, motorcycles and aviation tyres, Toyo are Japanese, Barum is owned by one of the big names, Continental, I'd be happy to drive a Jazz with such tyres from those names
A reasonable choice from well known names, I have used mytyres for several years, 12 tyres in total, I'm a satisfied customer.
Goodyear Efficientgrip at £72 are OEM tyres on a Vauxhall Astra I had from new, had a set installed on my Dsi Jazz , no issues with fuel efficiency or wet weather grip to report.