How do I add a receipt or expense in a foreign currency? My default currency is GBP, but we have many international clients and I can't create a receipt.

I see how important it is to manage currencies for your receipts and expenses, simon-object-rea. Allow me to share some insights so you can get back on track.

You can add or create receipts or expenses in foreign currency depending on your supplier's currency. However, once you've added a supplier and recorded transactions with them, you can no longer change the currency in their profile.

Thus, if you need to track new transactions in a different currency, we can make the existing supplier's profile inactive. This will allow you to keep previous transactions of the supplier in QuickBooks.

After that, add the supplier again with the correct currency. Here's how:

1. Go to Expenses, then choose Suppliers.
2. Click New supplier.
3. Select a foreign currency from the Currency ▼ dropdown. 
4. Enter the supplier's name and other info.
5. Hit Save once done.

To learn more about managing suppliers in QuickBooks, see this article: Add and manage suppliers in QuickBooks Online.

For reference about suppliers and managing other related transactions, you can check out this link: Expenses and suppliers.

I'll be here if you still need further assistance or have follow-up questions about suppliers and currencies. Have a great day!