One of Bank of Scotland's longest-serving corporate bankers is to retire later this year.

Ian Robertson, managing director of relationship banking, will step down on June 30 after 36 years with Bank of Scotland and HBOS.

Robertson leads the teams providing day-to-day banking services to trading firms and real estate businesses across the UK. Prior to that position, he held senior roles managing lending for a number of high-value corporate clients. He joined the bank's corporate board in 2000.

He is being partially replaced by Adrian Grace, who will join HBOS from Barclays, where he was responsible for its UK insurance operations. Grace has significant business experience: at GE, he was responsible for marketing and strategy and was a regional vice-president with the company in the US, while at Sage Group he was managing director for the small business division.

The bank said: "Ian has played a central role in the growth of the corporate banking division.

"During the last five years, the loan book more than doubled to £79.2bn. The division's profits increased from £523m (UK GAAP) to £1.42bn (IFRS) over the same period."

Peter Cummings, chief executive at Bank of Scotland Corporate, added: "Ian is a relationship banker in the truest sense of the word. Over the years, he has built and maintained countless strong customer connections for Bank of Scotland. On a personal basis, Ian has provided considerable help both in my role as managing director and now chief executive."

Grace will take up a new role of managing director, commercial business, assuming Robertson's responsibilities for trading firms, while there will be a further announcement on who will be responsible for the real estate business.

Bank of Scotland Corporate now has more than 8300 employees, with total lending of £82.4bn at June 2006.