How to update ssl on appache.
Once you receive the certificates I converted cer to crt lis so:
openssl x509 -inform DER -in your-cert.org.uk.der -out your-cert.org.uk.crt
Copied pem to newly created chain file. If you look at .pem key it has the certificate and the chain
cat your-cert.org.uk.pem > your-cert.org.uk.chain.13_06_0000
once the above is done copy the files to /etc/ssl/certs/ and change that on virtual host and restarted apache.