It prolongs a long-standing relationship with the weekly politics and current affairs title, which has an ABC of 63,343.
Andrew Neil, chairman at Spectator publisher Press Holdings Media Group, praised Wyndeham for its "great service" and ability to evolve to changing print media requirements.
The stitched title is printed on Norske Skog Norcote Super paper, and has a tight production schedule.
"The schedule is very demanding. We receive files at 1pm and the first collection is at 6pm," said Heron managing director David Emeny.
The Spectator has a mix of subscriber and newsstand sales, and is one of the titles set to benefit from Wyndeham’s £300,000 investment in two mailing lines.
The spend encompasses a new Sitma line that has selective inserting and the ability to inkjet in three positions, along with a refurbished Buhrs system to provide additional capacity and backup.
"It’s the sort of added-value service that it makes sense to invest in," Emeny added. "The Sitma is all-singing, all-dancing and we’ve brought all our outwork back in-house."
Heron’s mailing was previously carried out by Finco in Witham. Heron has Tupe’d over a number of staff from the company to run the new lines.
The Sitma is already up and running, and the Buhrs is just about to go into production.
The company took out two surplus stitching lines to make room for the new kit.