Yes it does only allow for 26 but if you are really good and clever it is posisible to print 2 seperate sheets off with the seperate postcodes on ie 52, and cross check the routes with the naked eye,
Its frustrating but its possible,
If you are really commited to the job though you could get one of those garmins that have just been mentioned, I didn't know they exist.
Mine cost me 80quid and is crap so the extra 70 would be well spent.
Dean.