I was brazen enough to contact their customer services and ask if there were any live discount codes as missed the package deal at John Lewis (free peel and pellets), which seems to have been removed as of today. I've been ponder over this for a year so am finally jumping in before the silly season starts and stock is low. Best voucher to date I've seen was 20% off on Black Friday.
Code: UK10%-TAWK seems to apply to anything on the site. Enjoy!