@Cazz you can try using Windows printer as it obeys printer driver’s page setup.
You can find a sample HTML template here.
Do you want to print A4 size Tickets from a laser printer? We support ESC/POS printers for ticket printing. We also have HTML printer to print from ticket printers but it converts printout to postscript so it supports multi language. I mean for both printers we assume there is a ticket printer.
A4 printers are generally used for report printing but few people also uses A4 printers for invoice printing. However as it generally prints on pre-printed invoices (eg. logos are already printed on paper) there is no logo printing support.