Yes, I have been known to curse having to carry mine about..... much better now I've moved out of London and it's easier to drive everywhere! I have developed quite a talent for conjuring parking spaces within feet of the entrance of any given performance venue!!
The Kouss and Bottesini are both wonderful pieces, I too encountered them first at school but they are still in my repertoire today- I would have put them way harder than grade 8 though!!

I don't know the Keyper or the Ridout well at all, but I remember doing the Britten for my exam and the hours spent with my teacher trying to get the rhythm correct in the middle section. It took me ages to work it out! All the best to your friend for their exam.
At the moment I am doing a lot of orchestral playing, as that's what I enjoy the best and hope to make my career doing. When I teach I use orchestral excerpts instead of studies!! The parts are amazing sometimes, I especially love the way the bass underpins the whole structure of some works. However, I have just started learning the Bottesini Passione Amorosa to play with a friend next term (it's HARD), and I have hijacked another friend's string quartet and made them play the Dvorak G major Quintet with them!
I have a reputation for insanely high-achieving insanity amongst my pupils- I teach so many cellists and violinists that the basses know they are special

At the end of last term I set up a quartet with my three most advanced pupils and we ended up doing a little tour of the music service end of term concerts. Four double basses doing Star Wars and the Pink Panther music brought the house down, and by popular demand I am now arranging Christmas Carols for groups of four....or even bigger.....
I really do love the bass, even though I know it's very sad. I wouldn't play anything else!!