This website will provide you with a search facility to check that the MTC skillcard (Mandatory Technical Competence) being shown to you is valid.

The card shown to you has been issued to the site operative as someone who has been assessed by a UKAS approved Certification Body in meeting the Mandatory Technical Competence for the card holder's industry's sector. The Mandatory Technical Competence assessment is based upon the UK’s National Occupational Standards.
Each MTC skillcard holder has demonstrated their knowledge and practical skills as the MTC skillcard highlights. The MTC skillcard issued to all site operatives is valid for a maximum period of 3 years only. To re-issue an MTC skillcard to the site operative, he or she must once again demonstrate that their knowledge and practical skills are current.
To determine that the MTC skillcard being shown to you is in date and valid, you can use this website's search facility box in one of 2 ways:
By scanning the QR code on the back of the MTC skillcard
By entering the MTC skillcard number (printed on the front of the card)
Cardholder Name
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Card Number
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Qualified for
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Valid until