Insulated playhouse tips and ideas?

[piggypig]

Hi all p I'm in the process of insulating and heating my guineas play house and was hoping you lot would be able to help me. What are the best materials I can get including insulation, wood to board it and type of heater (safest possible) Pictures for ideas would be fab! Thanks in advance. :rose

 

[piggypig]

Never mind, its all done.

 

[flips]

I'm sorry we missed your post first time round. I'm sure you've made a fab job of insulating your playhouse. What did you use in the end?