any chance of a photo of the whole tree or the branch and bark-- this view makes me think of rowan or ash

rowan is more serrated. i did think ash but what was the seed like if it is ash the buds are black and the bark is grey.

its the smell thats confusing me!

Many thanks for your help. Here's a couple more photos which may be of use to you.
As to the smell of the leaves, yes, there is a definite sweet smell.

Given your description Derek of the smell my initial instinct was to wonder if it could be related to the Eucalyptus genus ?

can you describe the seed was it in a berry ?

i've got an ash leaved Acer ( Acer negundo) I'll go and smell the leaves.....

nope not that ! and the ash (Fraxinus) is hardly out yet Hmmmmm...

its got me ' googling now' have a look at Fraxinus cuspidata-- called the fragrant leaved ash .....

Anybody go for Laburnum?

Both ashes and acers would have opposite leaves, and the leaves on this one look alternate. Between the fragrance and the leaf appearance, I'm thinking of something in the sumac family.

i can see what you mean bulbaholic . I think the leaflets do look opposite apart from the terminal one.

Picked up in Kew Gardens I was hoping it might be a little more exotic ..its the medicinal fragrance thats foxing me ..

Hi, Derek
It can be Juglans regia (Walnut tree). Almost sure...:)
This tree grows very tall and big and it's not for small gardens. It gives a deep shadow and very hard to remove because of its strong root system.

It might also be a Black Walnut (Juglans nigra). It's supposed to have fragrant leaves too. I don't remember Arizona Black Walnuts having fragrant leaves, but that's a different species (Juglans major). Also, it's been a while since I've had one in smelling range! : D

Hi all, many thanks for your swift and knowleadgable replies. Having looked through them and suddenly remembering what the seed looked like I have come to the conclusion that it's a Fragrant Ash.
Again, many thanks for your help

its very special isn't it-- I'd never heard of it but its looking wonderful in your garden :o)