Yes, as far as we are concerned, you can sell resources from outside the UK. Of course, you must always comply with the laws of the country you are located in.
The Tes site supports multiple currencies for buyers, which is dependent on their IP address.
However, the royalty you receive for each sale will be paid in the same currency as the price you've set for your resource. This is either GBP or USD.
Further information about understanding the global catalogue can be found here: https://community.tes.com/threads/uploading-resources-understanding-the-tes-global-catalogue.756027/