Thanks i found that one on the forum and have used it and it removed all the numbers in all the tracks for me in a chosen field, but indeed it does still leave spaces.
Edit: For files starting with numbers and other characters i've just found it easier to just remove a certain number of leading characters instead because it also removes any spaces in between numbers or letters. How to remove a certain number of leading chars?
If it starts with 2 numbers then type in 4 between the brackets because it counts the spaces as characters, and if it starts with 3 numbers type 5 between the brackets.
If something should happen and the numbers end up somewhere else in the filename, title or another field then that first format string will remove all the numbers nicely wherever they may be.