Hello Andrew,thanks to your helpful observation about the glass in the pond, we have already corresponded. But welcome to the website too, and should you want to come to the next committee meeting on 9th October and you would be most welcome.
Back from the pond; with the help of BCC park staff we revoded as much of the glass as we could. I think it is reinfoced glass, as it was very crumbly, and some pieces may still be there, but hopefully not much is left.
Once again thanks for spotting it and alerting us Andrew; we rely on support of such Friends as yourself.