"Leverkusen" climbing rose

I have lately been musing on yellow climbing roses. It was "Maréchal Niel" that set the standard in the Victorian and Edwardian era. It was bred in 1864 and named after Adolphe Niel (1802-1869), a French General. It was long described as the finest yellow climber ever bred and was for long the "must have" rose.

(Another Edwardian "must have" rose, "Gloire de Dijon" is sometimes described as a yellow rose, or at least buff-yellow, but it is in reality just buff).

Maréchal Niel was the classic greenhouse rose, and is now considered slightly too tender, slightly too demanding, slightly too disease-prone for modern gardens.

Leverkusen is a hardy and reliable alternative, bred by Kordes and like Gloire de Dijon named after a town. In this case it was the chemical factory town between Cologne and Dusseldorf. It should really be a blue rose, as this was where Herr Leverkus made his ultramarine dye.

Pale yellow, hardy, reliable, repeat blooming it is a lot less trouble, but (sigh) without the size and quality of bloom that made the Marshal a legend.