change coordinate format DM -> DD

So the required format and inputs for the DegreeFormatter are as follows
 

DD°MM.MMM’ (E|W|S|N)

So your x (long) would be  3°14.545’ E
and the y (lat) would be 51°06.796’ N

Combined it should be:

51°06.796' N, 3°14.545'E

I’m not sure at the fastest way to do this but I would probably try the following

Extract the direction from coordinates using a couple of SubstringExtractors (just get index 0). save these as an attribute called “_direction_x” and “_direction_y” or something

then use a StringReplacer to remove all the <space> charachters and letters - regex = [a-zA-Z]|\s 

Then after that you can use an AttributeCreator/manager to make new combined x, y values which you can feed into the DegreeFormatter.
 

@Value(y)' @Value(_dicrection_y), @Value(x)'@Value(_dicrection_x)

This should give you an attribute with the value 51°06.796' N, 3°14.545'E which you can feed into the DregeeFormatter.