Ulidiid Fly

A male Herina lugubris (Diptera: Ulidiidae).

The frons is bright orange:

Specimen taken in Whiteknights Park, Reading, UK, on 2018-06-30.  Identified using the key of Clements (1990).

Muscid Fly

A male Lispe tentaculata (Diptera: Muscidae).  Identified using the key of Fonseca (1968).

The the face is yellow and the palps are large and orange (though they appear white in the above image):

The main tarsus on each fore leg has a 'long finger-like process':

Normally these processes align parallel to the tarsus and do not stick out as much as this.

This was one of 4 specimens that I caught in Whiteknights Park on 2018-06-22.

Platystomatid Fly

A male Rivellia syngenesiae (Diptera: Platystomatidae).

Specimen taken in Whiteknights Park on 2018-06-22.

Only the second I have come across: I caught a female in Whiteknights Park on 2017-06-17.