In your recent announcement regarding the changes to Royal Mail 2nd Class deliveries you state that Large Letters are not affected by the changes:

'These upcoming changes will directly impact 2nd Class Letters only. Large letters, parcels and 1st Class services will not be impacted by these changes.'

Is that actually correct though? 

I don't think it is as, although Ofcom and Royal Mail only mention 'Letters' in their official announcements, the Ofcom consultation document states (bottom of page 13) that Letters includes Large Letters:

' 11 'Postal packets' is defined in section 27(2) of the Act as "a letter, parcel, packet or other article transmissible by post."  For clarity, we use the terms letters and parcels in this document.  Letters includes Large Letters, unless stated otherwise.'