I'm sure that you will know what this is straight away. I noticed an odd lump of what I assume and hope was mud in the corner off one of outside walls with holes through it. Clearly a nest of some sorts. When I went to remove it it was solid like brick and inside were two strange insects which flew off. They were like they were in two sections vertically. What are they and are they nasty? Do they sting or bite?

Maybe waspys ??

Wasps.

Spray the nest with insecticide and run away very fast.

Didn't look like any kind of wasp I know of. Are they a strange Spanish wasp?
About 2 - 3 cms long vertically and in 2 distinct sections.

Alas I've never been that close.
However they build a nest for their grubs, in corners etc.

looks a tad like a mini mud hut!

good luck

PS Mosi spray appears to kill so many beasties ... not tried it on waspys as yet ... but think it will work!!

Well it's gone now but I shall be wary should they come back. In fact I felt a bit guilty after I had removed the nest as one of the creatures came back looking for it. A quick squirt of repellent sent it packing.

I think it was a thread-waisted wasp.
They'll nest anywhere, even indoors.
'They' say that they don't sting unless you tread on them or something like that but to me a wasp is a wasp and I run away.

That sounds right as I found one had built a nest on my curtains! But when I removed that one there was just a larvae inside.

They tend to build a nest in or under the roof tiles, when we put a new roof on our house there were lots of the nests there!

A mason-wasp. They look like they are in two sections when they fly with their legs hanging down below them in an untidy looking way. They lay an egg in live but paralysed prey - spiders usually - and seal them up in the mud nest. Also know as 'mud-dauber'.

The ones I have seen look like the Potter wasp, is this like it. mine were not like the mason wasp.

I always wondered what they were called - we get these

A mud-wasp maybe?

we get these, I think. They fly with their legs hanging down like a daddy long legs.

Lynnxa UGHHHHHHH too big shivers I don't like the look of them and there seems to hundreds of them or similar here where I am on holiday arghhhhh