Same here I deal with most countries and Canada one of the better ones sending stuff to and receiving.
Even if did find some one will add cost posting £6-£9 on the cheap within UK to someone that could carry over, then process of sending, meeting and or travelling to destination whilst there.
Could choose Hermes within UK but would take longer than sending Royal Mail International usually 4-5 days from past experience.
Russias slowest by far two weeks air mail, NZ 2 days regularly, US a lottery used to be 5 days 11 years ago now around 9 min to 15 days or months in customs.