Elongated colourful wasp?

Elongated colourful wasp?

Observation - Elongated colourful wasp? - UK and Ireland. Description: A long wasp(?) found on a fence. It moved between nail holes, possibly looking for places to lay eggs. Base of abdomen red, the rest black with some white markings. Approx 15-20mm long.

A long wasp(?) found on a fence. It moved between nail holes, possibly looking for places to lay eggs. Base of abdomen red, the rest black with some white markings. Approx 15-20mm long.