Where could I find some timber cladding?

[Homers Double]

I thought the general masses here may be able to help...
I want to find some of this wooden cladding

It's T&G but I don't want cheap pine as it's potentially going over to the house in Italy, this is approx 1/2" thick going by me getting my finger under it at the base.
I just can't seem to find a suitable option on any UK site, sourcing it in Italy whilst easier if it's local is difficult to do as sometimes we're only in a little hire car.
We're going over in my truck in June so may have options.

 

[Oldhippy]

A decent wood yard I'd think. When I was doing the boat I went to a few who could do all sorts. Not cheap though, but you get what you pay for.