Usksider: would this solve your little "flashing" problem?

Travel John Disposable Urinal
2 used & new available from £4.70

Sorry, no customer review of this one!

1) They will not buy anything that requires going out of the house: Therefore, if it cannot be purchased from Amazon, they won't buy it.

2) They will seriously suggest items like this as a present for your mother:

Here is a really helpful Amazon review of the item:

I bought this item on the spur of the moment whilst shopping in the Lake District. As we climbed our first hill the next day I packed it into the top of my ruck sack a bit unsure if I'd be able to use it or if it would work. Normally I'm running down the mountain, hiding behind a rock while my husband stands watch for passers by or exposing my rear to the midges but with the Shewee it offered easy to use complete freedom without exposing a jot. So good I'm now buying one for each of my daughters who both hate sitting down in public toilets. Really good to keep in your bag for all occasions anywhere.