I am same as you , working with year 6 transition and this year bit with year 5. Now, what i did in adition was run a Maths Challenge for the feeder schools one morning in our school. Go onto Liverpool Mathematical Society site and look at Funmaths. For 20 quid you can buy a disc, it was 20 quid three years ago, with loads of graded activities for a fun event, all in age ranges yearly from year 5 to year 11. these are great resources, (they call it a Maths Roadshow i believe) you photcopy and laminate loads of activites. anyway itis great and sooooooo easy to set up. If you have problems finding it let me know. also, I do a maths relay where 4 teams run up and down a hall,collectig a question/task, completing it , running across hall to drop it off and get the next task. a real fun 2 hours for year 6. if you want more details let me know. where are you in the country by the way?