Best way we've found to attract bees to the plot is to start beekeeping! We started last year with 3 hives, and now have 7 hives, not cheap but definitely enjoyable, plus fantastic pollination all over our allotment site!
If you dont want to keep them yourself, then consider allowing (if you can get permission from the allotment committee / council) a friendly beekeeper to base a couple of hives on your plot, not only would you get the pollination, but also a share of the honey! Try contacting your local BBKA for any advice or help!
HTH
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