I also didnt disagree with you re drain bags:
I just added that:
They can be obtained for free but often the materials can be "old ladyish" so one in a style in keeping with the DDs taste might be nice
BUT
Dont spend much as it wont be in for long, if at all.
And she may assiciate it with the drain so may not want to re-use it after
Army horses loose on London streets