Looked into this after spotting a code on a deals site about a month back. Some promo codes at Golden Clover are genuinely open to existing players while others are new registration specific — the distinction is usually clear in the small print attached to wherever the code was shared. Entered mine through the promotions section inside the account area on https://goldenclovercasino.co.uk/ and it applied without any issues since it was an existing player reload code rather than a welcome offer. Worth checking the code terms before getting excited since new player codes entered on an existing account typically just return an invalid error rather than applying at a reduced value