North Sea day rates for term charters of platform supply vessels have surpassed levels not seen since April 2015, according to Clarksons' research division this week.

For PSVs with at least 900 square metres (sqm) of deck space, rates on one-year charters have seen a 40% rise, year on year, to an average of £8,750 ($11,670) per day.

The term-rate increase from May to April was much more modest at 3% for 900-sqm PSVs, although it does show a steady market.