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It's best to leave the 'sp' out and just put Ichneumon. You would then find that there were many more additional pictures with which to compare. The 'sp' adds nothing at all, really!
My Flickr photos...
The easiest way to separate ichneumons from Aculeates ('normal') wasps is the number of antennal segments. Ichneumons have many bead-like segments (>16), while Aculeate wasps have no more than 13 more elongate segments, as here.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Thanks always useful to get pointers on id - although I went back to Chinery and the picture clearly shows the protonum does not reach the tegula which is also indicative of Sphecidae.
It is also interesting to note it is possible to sex this species as the hairs on the thorax are whitish in males and black in females
Lat/Lng: 50.7178, -1.8651
OS grid ref: SZ096909