Hello Glyn,
You have several plugins that are out of date.
For clarity, you are, I think, talking about the text and the $ symbol on the Listing Preview page, which includes text like “you will pay”
Once you have the plugins updated, you should see a change immediately.
If you still don’t like what you see, you can change that text by translating the Payments Manager. Refer to this post https://wpgeodirectory.com/support/topic/texts-remain-unstranslated/#post-342339
The translated file should be located here: /wp-content/languages/plugins/geodir_payments-en_GB.mo
Related:
https://wpgeodirectory.com/docs/translating-addons/
https://wpgeodirectory.com/docs/translating-themes/
One other related issue: In your pricing packages you have the Amount GBP in the titles, but that amount doesn’t match the pricing package ‘price’ itself, so you will want to update those prices packages too, as you go along.
In an unrelated issue, you are missing two pages at GD > Permalinks. When you get a chance you should create pages for GD Home and Info
Let us know how it goes