Wellington (Somerset) Triangular WEF cancel and TO PAY Charge Mark

A couple of items from Wellington (Somerset), firstly an undated envelope cancelled with a "WEF" triangular mark.  The envelope would have been printed matter (so not wanting a datestamp) and dates from 1912 to c.1935.

The second item is an underfranked envelope with a "2D / TO PAY / 860" charge mark but only a 1d postage due stamp.

The envelope was franked at 1½d.  The 2d postage due was based on it being a letter (rate 2½d, deficiency 1d) but it was actually printed matter (rate 2d, deficiency ½d) so was liable to only 1d postage due.  The printed matter rate had gone up from 1½d to 2d four days earlier.