Melanostoma and Scaeva ?

Hi I just want to know if I'm in the right ballpark for both before recording, both in a garden today next to a relatively unmanaged field and near Therfield Heath Herts.

I want to say Melanostoma scalere as there does seem to be a greyish frons but its a first for me and the Scaeva just seems too small and early though judging by the wing condition it may have overwintered.

Ps ok Scaeva could just be a dark Eupodes luniger with very yellow face but woud still like confirmation.

Thanks Nick