The £50million expansion of the Orchard Centre has progressed to the next stage.
Following the closure of High Street, the next phase will allow construction of the new public square and surrounding restaurants to begin.
In addition, there are two additional areas of car parking that are now available, with 120 spaces already open and a further 70 to follow shortly.
A total of 875 car parking spaces will be available at the Orchard Centre when expansion work is complete.
Names already signed up for the 95,000sqft extension include M&S Food Hall, H&M, River Island and TK Maxx, as well as Costa Coffee and Starbucks.
Thomas Cochrane, development manager at developer Hammerson, confirmed the next steps are being put in motion.
He said: “Work is now well under way and on schedule, with the development already taking shape as new structures including the flagship M&S Food Hall building are put into place.
“Convenient car parking is essential and so we are pleased that these extra spaces are becoming available and that we continue to offer free parking, for up to two hours.
“We are grateful to everyone visiting the Orchard Centre for their patience while construction work continues.”
Councillor John Cotton, leader of South Oxfordshire district council, said: “Local residents, shoppers and visitors will be aware of the closure of some parking spaces at council-run temporary car parks in High Street and Broadway to make way for the second phase of the Orchard Centre.
“We know that any loss of parking spaces has an impact and we have worked closely with Hammerson on this issue.
“We are very pleased these extra spaces are becoming available at an early stage in the development.”
The expansion of the shopping centre is part of the proposed Didcot garden town plans, which will lead to the creation of 20,000 jobs and 15,000 homes and exciting community facilities over the next 20 years.
In preparation for the closure of High Street, bus services were re-routed along Station Road, which was transformed from a pedestrianized zone to accommodate this.
The shops, restaurants and cafes are expected to open in spring 2018.