Thank you! I used a business card company and provided the files in the Individual Card folder to them for printing. Just check they are the correct dimensions - they were for the various companies I used!
The preferences I used were:
- Double sided landscape - 85x55mm
- 400gsm silk paper
- Gloss lamination on both sides
I'm in the UK and don't want to promote a specific company, but there are quite a few out there. You can usually ask to see various samples and the print files they have produced for you as a preview before confirming to go ahead.