is this a Mayfly?

is this a Mayfly?

Observation - is this a Mayfly? - UK and Ireland. Description: This little guy landed on my waders while I was lochside having a coffee break. It looks a bit like a Mayfly but the colour seems wrong. It's still very cold here, too. and I wouldn't expect to see Mayfly for a few weeks yet.

This little guy landed on my waders while I was lochside having a coffee break. It looks a bit like a Mayfly but the colour seems wrong. It's still very cold here, too. and I wouldn't expect to see Mayfly for a few weeks yet.