Which groups have you found best for Uk or European city breaks - Solo travel

[Octoberholiday234]

Which groups have you found best for Uk breaks or European city breaks as a solo traveller. Or break around Rhine region.
Thanks!

Anyone?
Thanks

Try Outdoor Adventure Girls for solo female group travel with likeminded women!

Edited because I misread the question and thought you were looking for destination suggestions rather than travel groups