Good polish for clear coat cars

[s2racer]

I have a couple of Honda S2000s. For the one I have had a long time I have used Zaino Z2 for years

I can apply in sun (wtf is that?)
It's easy
It's super durable
Gives a great gloss

You cannot get it for love or money in the UK now so I am seeking an alternative. It's a polish (not a wax, I don't find them.so durable) which you put on, allow to dry for sat 30 mins then buff

Any recs?

I CBA to do it every month so waxes are out, plus can't be used on a nice day generally so no waxes please

Tah