Hi Ruth (and Honey!), welcome to FDMB. This is a great place for advice and support.
It's great that you'll be learning to test Honey's blood glucose at home. Well done for wanting to do that.
In your post you say that Honey was looking for food 4 hours after her shot. ...Newly diagnosed cats are often hungry, because they can't utilize all the nutrients from the food they eat (that's one of the reasons that many of us feed our cats more than twice a day). But it's also 'possible' that Honey's blood glucose had dropped lower 4 hours after the insulin shot, and she was looking for food because of that. ...Once you're hometesting you'll be able to see what her blood glucose is doing, and that makes the diabetes much easier to understand and to manage.
With Caninsulin the lowest blood glucose is 'often' 4 - 4.5 hours after the insulin shot, but in some kitties it can be earlier or later than that. Ruth, you may be interested to see our beginner's guide to Caninsulin here:
http://www.felinediabetes.com/FDMB/threads/beginners-guide-to-caninsulin-vetsulin.186099/
There is also some info for new UK folks in the link in my signature at the bottom of this post.
Do shout out if you have any questions or need any help.
Eliz (waving from Surrey!)