LONDON, March 6 (Reuters) - Supply of the five North Sea crude oil grades underpinning the dated Brent benchmark will average about 560,000 barrels per day (bpd) in April, up from 498,000 bpd in March, loading programmes showed.

Brent, Forties, Oseberg, Ekofisk and Troll are the five North Sea grades underpinning the dated Brent benchmark. U.S. WTI Midland crude, which is also part of the benchmark, does not have a loading programme.

(Reporting by Alex Lawler, writing by Enes Tunagur in London; Editing by Toby Chopra)

((enes.tunagur@thomsonreuters.com))