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That is a good key if trying to identify a robberfly on the continent, but the majority of species on it are not found in this country, so it could be confusing. It also uses Tolmerus for atricapillus and cingulatus, rather than Machimus.
This is most likely to be Machimus atricapillus or cingulatus. If there are mainly pale hairs on the frons, it would be the latter. Can't be sure, personally.
My Flickr photos...
Ahum.....this one baffles me a bit, most points toward M cingulatus as Ian remarked. Shape of ovipositor is a bit off for that. Have to look at this one again later. Brilliant picture by the way.
Lat/Lng: 51.3, -0.8
OS grid ref: SU9057