Wondering if people have experience of these - I'm signed up to a free one with my 4 month old but haven't been to anything like this yet. I'm not a fan of sitting on cold hard floors so should I take a mat for him and/ or me or would I seem strange for doing so? Do I need to take anything barring having a changing bag on hand / in the car? Do people typically carry their babies into these things or push their buggies in to the building? Any other advice? Unfortunately the company I've booked with haven't been very responsive so am also asking these questions here, plus I guess their stock response might end up different to the reality!