Hi Kate maybe you should have made your bird boxes flat pack self assembly ,I have seen some blue tits having a look at my boxes we may be lucky again this year,
I think it is a great idea for the birds providing Nesting boxes. There does seem to be a lot of species in decline. I do not see a lot of Sparrows at all and where I live I used to see lots and lots of Robins and do not anymore. It is such a shame.
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I've been watching blue tits investigating our nest boxes and those in the gardens opposite - think Spring is springing
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.