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.