Hello,
We had a piece very much like this in the Contemporay and Post War glass sale at Auction Atrium last October.
I described it thus:
"Low wide ovoid vessel with tiny opening to the centre of the top; irridised clear glass with a pink flowerhead to one side. Incised marks to the base, 'Glasshouse' and 'FFL170073', suggesting the date of 1973."
Despite making a number of enquiries about who the maker might be, including Adam, I couldn't find the answer. I also suggested that it might be Fleur Tookey, as you thought possible Marcus, but I was reliably informed that Fleur Tookey had said categorically that is was not by her. (An unempeachable source).
Not completely helpful, but at least avoids one possible mis-attribution (as was also pointed out to me!!).
Nigel