I bought a Poole pottery vase in a charity shop purely because I like the colour and shape, but a friend reckons it's worth a lot more than the £5 I paid for it. Looking on the internet suggests that the Poole pottery mark is for pottery made between 1955 and 1959, and it's a Freeform design. I've found pictures vases of that design but different shapes, but nothing of the shape I've got. Any idea where I can get more info?