Sorry for delay in replying. Been trying to get the rate for the price change (parcelforce impossible!). I have thought of somthing that I have change on my site and am putting into 3.3.5 release for php7 in each of the modules. The class constructor instead of being "function <MODULENAME>" is being replaced with "function __construct()"
So For 1st Large letter
PHP Code:
class rm1stlargeletter {
    var $code, $title, $description, $enabled, $num_zones ;


    // class constructor
    function rm1stlargeletter() 
Is becoming
PHP Code:
class rm1stlargeletter {
    var $code, $title, $description, $enabled, $num_zones ;


    // class constructor
    function __construct() { 
Don't think its an issue just something that php 7 is changing.
Was hoping to post changes tomorrow for new rates. Might do it even if I don't have all the Parcelforce rates.