Kerstin here from the Shopify Guru Team :)
That is a very good point and to avoid this discrepancy in shipping costs, here are some suggestions:
If you have any further questions, just reply to this thread or reach out to our support channels via chat, phone, or email.
All the best,
If you are shipping 100+ parcels per week or to I can introduce you to a company that offer more reliable shipping from China than epacket with local look labels so no CN22 stamps. Rates are comparable and service/tracking + customer experience is much better.
You can contact me at firstname.lastname@example.org
"£1.04 in UK money but £4.07 to the UK, massive difference in shipping to the UK which can prove very off-putting for the customer." why customer would look on shipping to other countries ? It is common and very normal that different country , different distance, different shipping frequency to the country ..that all makes a differnt price. Better to be fair with shipping, since some customers may wonder why your shipping fee E-pack ( which is transparent on internet ) is more expencive than the other sellers ( talking about shipping to the same country ).