Thanks everyone! I haven't been in a rush until now, I think I really just don't like the cot ds has and want dd's for him. Selfish mummy! Hmmm I just laid out her grobag, there may only be 20cm spare... but she curls up, I think she will be ok in that size bed for a bit. I agree, once she chooses to move to the bgb the transition will be easier.
Someone in my neighbourhood is selling a toddler bed cheap I saw today on gumtree. I thinkIing of getting it. That way she can keep her same linen on it and maybe it won't be so scary. Should I put that where the bgb will go, ditch the story chair and keep the cot for a bit, or make a leap to toddler bed putting it where the cot is, but, keeping the story chair?