Bloke went round the Tour of Rutland sportive last year on a Yeti 575 with knobbly tyres!
Apparently the Bianchi he’d ordered on C2W was late being delivered.
Spesh Roubaix if you can cope with the big price rises in recent years, Giant Defy, Cannondale Synapse, otherwise Ribbles carbon sportive bikes are great value. Their audax bikes are a bit harsh and the blue frame struggles to take 25mm tyres which help with comfort (Loads of people will slag them off for service but I’ve never had problems)
If you live anywhere Whaley Bridge, pop in to the Bike Factory and check out their own brand “Biaggi” 631 steel framed audax bike. Then buy one, and give me a report, I am sooooo tempted….