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I opted for IKO Enertherm PIR 50mm. It wasn't cheap. I think I paid £35 a sheet; and it was 1200 x 2400.
I will tell you something I did notice is that so many building sites seem to throw so much of it away. I was tempted to go around and ask for off cuts. I figured it it didn't need to be a continuous layer so why not save some dorrah.
I'm very happy with how mine turned out. I was concerned that 50mm wasn't enough as it was directly on to a concrete slab like yours, but the combination of the insulation, chipboard and cork have worked really well. And I thoroughly recommend cork as a finish. I found a husband and wife run company in Croydon and they were excellent.
Lanterne_Rouge
Ifonlyiwerebelgian
This is precisely what I was thinking. It would raise it up about 3-4 inches at the entrance. So a small step which isn't the end of the world.
The costs of this are getting a bit out of hand. There doesn't seem to be a cheap insulated option.