6 speed gearbox - difficult shift from 1st to 2nd at high revs

[clarkey]

Hello

I have a 6 speed gearbox which was overhauled by Road and Race in 2013, about 6,000 miles ago.  A new R500 clutch was fitted at the same time.

When at high revs it is very hard to shift from 1st to 2nd - I pretty much have to shift to 3rd instead. It doesnt crunch, it just doesn't 'go in'.  Shifts at lower revs are fine, all other gears are fine regardless of revs, and 2nd is fine coming down the box.  it is just from 1st to 2nd at high revs.

The car is a 2002 Superlight R with about 210bhp.

Any ideas?  Thanks for your help!

Steve