In his new role, Neilson will be responsible for growing the number of business customers in the regions. He has worked at TNT for 14 years and is particularly experienced in strategic planning and technology.
According to TNT, its regional business has experienced impressive growth in the last 12 months: to date, TNT serves more than 1,000 SME customers and last year grew its volumes by more than 100m items.
Neilson said: "The development of the regional businesses is a tremendous success story for TNT Post and offers further expansion opportunity, particularly in the end-to-end market.
"By growing this part of the business, more and more local businesses and SMEs will be able to benefit from high quality, innovative and cost effective services for the first time ever."
Davies will take over Neilson's responsibilities for growing TNT's Doordrop division, which was formerly known as Circular Distributors, in a promotion from his role as the division's new business director.
He said: "The current doordrop environment represents many challenges and opportunities ahead; clients want even better targeting, innovative ideas and strategically integrated campaigns than ever before so they can achieve the cut-through and the results they need.
"I am very much looking forward to working with my team in order to drive the business forward and serve the needs of our clients."