Thanks for your response. The problem does appear to be caused by the WooCommerce Multi-Currency plugin so I have reached out to them for support.
Second what @redndusty is experiencing – jQuery 3.5.0 was missing for me too.
Yes, you’re absolutely right… Silly me!
Thanks for your help, Stanislav 🙂
Of course! You can see the product option here:
https://whatadrag.co.uk/lashes/301-black-lashes/
Thanks for your help.