Hi Carolyn,
I know my photos were awful, I couldn't stand up long enough to take care with them yesterday, and my arms kept shaking, as I am not too well at the moment. Looking at the photos on ebay, I felt the scoops were pretty much the same, although they don't give measurements.
Hi Christine
Thanks for the links, they really do look similar. The blue in mine doesn't look as strong as in the one on the Whitefriars site, but it does seem to change according to what light it is in. Do you think I could safely attribute mine to Powell then, or was there someone else producing similar? It certainly has age as it has a lot of wear on the base.
I have a straw opal bowl as well which is almost identical, but is about 5mm taller, which I bought from a different seller. I am buying a lot of vaseline glass at the moment, it is the current craze

Thanks both of you for your comments

Janet