The consulting giant started a revamp of UK operations into four market facing business units last year.
The move followed a 29% drop in pre-tax profits during the first half of the year caused in part by problems with rail contracts.
In a trading statement today Atkins said: “Overall, the performance of our UK business has improved in the second half, against a mixed first half.
“We are pleased to have reached resolution on the contract variation negotiations in our rail business which, as previously indicated, impacted positively on our regional cash performance for the period.
“We have successfully completed the transition to our new UK operating structure, centred around four market facing business units, with implementation effective from 1 April.”
Atkins will announce its preliminary results on June 11.