It's incorrectly listed (by title), which might account for this Robin Day Polo Chair still being at its starting price of under £1, as opposed to something nearer the official £49 price point.
It's an early '70s design classic, albeit a functional one and one with a low price point. That's because this indoor/outdoor polypropylene, ergonomically-correct chair was designed for general use, not for showing off.
It was reissued on 2000, this being one of those reissues. The seller has 13 available in white and right now, the price is at 99 pence. So a possible bargain, that's for sure.