Two newcomers to the garden

 An unfamiliar plant popped up in the garden, near the compost bins.

Yellow flowered mystery plant

It had double yellow flowers and big lobed leaves.

A bit of research named it as Greater Celandine, the double flowered version. (Chelidonium majus "Flore pleno") I've never seen it before, either in the wild or anyone's garden.  How it got there is a mystery.  It is not much like the usual Lesser Celandine  (Ficaria verna) which is in the Butttercup family whereas Greater Celandine is in the Poppy family. Other poppies have sap called latex and Greater celandine has latex too when you break a stem - but it is a bright orange! The picture doesn't really do it justice.

Orange latex of Greater Celandine

Lesser Celandine

The name Celandine comes from the Latin and Greek words for swallow as it was supposed to flower when the swallows arrived and die when they left. This would make sense for the Greater Celandine, but not for the Lesser celandine which blooms in early spring. You can see the root in the scientific name of Greater Celandine (Chelidonium majus as  chelīdonius  is Latin for "relating to the swallow."

Another nice surprise was under a log.

It is a baby newt.  It is very small, probably about 4cm (1.5 inches)long, as you can see by the old sycamore helicopter wings near it.   I have never seen newts in our pond, but maybe they are there after all.  Like frogs, they start off as tadpoles and then leave the pond.  The etymology of newt is interesting as it was originally "an ewt" but now we say "a newt." Even longer ago it was known as an eft. In some words the "n" has moved the other way: "an apron" was originally " a napron"