Thank you everyone for all your helpful replies. I'd never thought of a ferret harness! My next try was for a cat one.
However I was lucky to find the perfect thing this morning at a small independent pet shop in a small nearby market town. Amazing when I'd tried bigger places like Pets at Home with no luck.
If it's of any interest to anyone else for their puppy it's a teeny, tiny harness & lead set, made for a puppy. It's nylon, quite jazzy with little dog shapes & "puppy dog" printed on, & completely adjustable, the smallest setting is even too small for Ellie & she only weighs 2 1/2 lb!
This one's red though there was also blue.
Think it's German, if my school German serves me right, as it's called a Welpen-Set & is made by Trixie, there's no web address to pass on unfortunately. It even comes on a card with two toys, a small ball & a latex toy (which was missing on mine so the shop owner reduced it
) Though even full price it's only the princely sum of
£5.99......I know from old the pound sign won't show up, so 5 pounds 99p ...bargain!
It's brilliant, perfect for a tiny puppy, so thought I'd pass on the info.