Having wondered if I was doing the right thing by increasing the order it seems like I have been vindicated by receiving orders, and payment, for ~50 in the last few hours alone.
Don't worry if you haven't got your order in yet, there will be enough (I hope) as I eventually decided that even 250 might not be enough, and went for 300. This *should* mean I have a few left in stock for anyone who misses the order <fingers crossed>.