It’s certainly different, isn’t it?
I haven’t grown it but Tropaeolum is the nasturtium family (literally “nose-twister” or “nose-tweaker”) and I have a small apparently yellow flowered species that I grew from seed but I can’t remember it’s name. It’s never flowered and it has small tubers with the rather spindly plant having light green leaves that twist their leaf stems around the support which is quite an unusual way of climbing.
Canary Creeper is a nasturtium too (Tropaeolum peregrinum).
Why not contact a botanical garden like Kew and ask some questions about this plant? If they don’t have it, then perhaps they might know of another garden that grows it and you might get some answers.

Nose-tweaker – I wonder how that name came to be! Love it Armorel.

Your T. tricolor pics show foliage exactly like my pentaphyllum Tralamander and the flower shape is similar. Do you remember what time of year it was flowering?

Very interesting question, seeingreen! Unfortunately I don’t don’t know the answer either! :-(( I have however grown the common or garden Nasturtium, T.majus, & I’ve also grown the Canary Creeper, which I liked a lot. It’s flowers are much smaller & delicate then T.majus. The leaves look nothing like those we normally associate with Nasturtiums. The flowers are small & a bright Canary yellow, lovely little things! Yet even these can grow several metres in a single season!

My Nasturtiums & Canary Creeper on balcony 23rd October 2002

I don’t understand why some photos open & others don’t! It won’t open for me either!