Lock shipping to one currency when selling in several

I have a business in the UK, but for a number of reasons, the default currency is USD.

Sales are 80% UK, 20% EU but all shipping is by Royal Mail. With USD as the default and weekly currency adjustments, this results in skewed postage prices. I'd like to keep the shipping locked at one value in GBP.

Any ideas, known extension suggestions welcome.

It's never simple for me.....

+ 1

I would like to know how to do this too. I am sure I saw a similar request and maybe even a solution once on this forum, although for an earlier version of OpenCart.

Well, if you wanted to recreate the Royal Mail rates, you could use Weight-Based Shipping (www.opencartx.com/weight-based-shipping) and set a shipping rate for each currency. That way you could keep your exchanges values for shipping consistent (e.g. always £3.00 if currency is GBP, always $5.00 if currency is USD).