ive been told to use fresh coffee grounds as a deterrent has any one else heard this or has any ideas
The most depressing fact about wire worms is that they can live up to 4 years before they emerge as adults. You can set traps for them. Put some potato peelings in a small container, Food tin with hinged lid would be ideal. don't close the lid totally, but put the tin in your border just below soil level. And you can put as amny as you like around the garden.
The wireworms will go into the tin and gorge themselves on the peelings, Check every couple of days and empty contents into a bucket of water, the fat grubs will drown. Repeat as necessary.