It is a grass spider
hourglass
The black widow spider.
The black widow is a shiny, jet-black spider with long legs and a red or orange hourglass-shaped marking on its underside. It is about an inch long, including the legs.
It may be a Black Widow spider. They are very poisonous and it is probably best not to approach it if you are unsure of the species. Black spiders have a distinctive red "hourglass" shape on its back.
Green lynx spider is the name given to the green spider. This type of spider is usually found on the green plants and is the largest North American spider species in the family Oxyopidae.
An hourglass
It is black, and has a red hourglass-like shape on its abdomen.
An Arrowhead spider is brown with a green back. This spider is also known as a Triangle Orb Weaver. This spider is not venomous.
grevillea mucronulata also know as green spider
a red back looks almost the same. But doesnt have an hourglass shape. It has a red stripe on top of its abdomen.
SPIDER-MAN all the way!
There are several different British spiders that have lime-green on their backs. This spider could be a cucumber spider or even a lynx spider.