steve, I managed to get this working thanks.
I had accidentally inserted the same line twice into my nochex_acp.php file.
The simple solution then is this:
replace:
PHP Code:
define('MODULE_PAYMENT_NOCHEX_TEXT_CATALOG_TITLE', 'Credit or Debit Card (SSL Secure) ');
with this:
PHP Code:
define('MODULE_PAYMENT_NOCHEX_TEXT_CATALOG_TITLE', '<img src="https://url_to_payment_cards.gif"> Credit or Debit Card (SSL Secure)');
I had inadvertently inserted a complete new line which wasn't being picked up due to a duplicate define 3 lines above it.
Thanks ever so much for replying, it definitely looks a million times better on the checkout page now.
Now.... onto my final problem... this one is also really difficult and I'm having a tough time solving :-)