Hi Emma. The only one I knew of was in the first photo from Oka however it's been on sale the last few days and the corner unit part is now showing as sold out. The other 2 are from Barker and stonehouse. Danetti also have a couple. if you want something really comfy I'm not sure if you're better off looking for a sofa on legs and going into a shop To try it for comfort and take a tape measure.The seat height needs to be around 45cm, I also would opt for fairly firm cushions and nothing too deep. All of the ones I've looked at online so far only show overall sofa height rather than seat height.. You could also commission one (maybe just change the legs for something taller which may not be a dear option) or does it have to be L shaped?

Maybe try ringing oka to see if the corner unit will come back in stock. Not L shaped but you could do the same as the image on the right. They're from angel and boho and come in various colours. I did also find a couple of sofas that would work re seat height but the back wasn't high enough (tables are usually around 76cm so need something c10cm higher to look right)