Small black thin insect interested in my Bee Hotel

I have seen a 1 inch long very thin black insect with an ants head and what looks like a second body shape sticking up from its back . There is also a lighted colour tail on the second body part. It was interested in the cells in my bee hotel that had recently been filled by a bee laying its eggs. I dont have a camera.Any thoughts as to what it could be and is it harmful to my bees
Everyone is just trying to be Happy.....So lets help Them.
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Ichneumon wasps generally lay their eggs on caterpillars or other living things or their eggs. The wasp larvae then use the host as a food source.
Before you worry about the wasp being harmful to your bees, bear in mind that it has its place in the natural cycle of life and is no more harmful to the bees than we humans are to the animals which provide us with meat, milk and eggs.
Here is a link to a variety of photographs and descriptions of British ichneumon wasps. You may see it there.
https://www.naturespot.org.uk/sites/default/files/downloads/british-ichneumonid-wasps-id-guide.pdf
A glow worm's never glum
Cos how can you be grumpy
When the sun shines out your bum!
Veal calves kept in confined spaces and killed at four months old.
Foie gras created by force feeding a bird that has already eaten its fill and doesn’t want to be fed any more.
Give me an ichneumon wasp over a human being any day.