personally I don't think a few practise holds are a good thing to do. They do take a while to get the timing right in the various wind conditions. I did 3 holds at Shoreham at 4000ft, below me was transit traffic at 2500ft and then circuit traffic at 1100ft. Even though it was busy it was good practice.
Another reason you may want to fly an ILS in VMC is if you became suspicious that your ILS receiver/indicator wasn't quite performing correctly so you could carry out a visual and instrument cross check.
Try Le Touquet for your practice ILS, you can do as many as you like, generally no booking, and just one 12 euro landing fee.