The growers say it is a compact bush 2mx2m and should not get as big and straggly.

Try clicking on the "B" in the alphabet at the bottom of this page, scroll down to "plants by botanical name", go to "Buddleja", then click on "Where to buy Buddleja plants"
Another possibility is to simply google the plant.

I've seen this plant in all the garden centres, it's not difficult to find Jay.

Thank you all for your replies. I was wondering if there was a dwarf version thats not too big?
Thank you

Their dimensions are 3' by 3', there's also another small variety that's a wee bit taller and they're 4' by 4'.

Hi Louise1, Have you seen it online with 3' x 3' dimensions? Has to be the flower power one tho.
Thank you

For an online supplier try this one, i've just googled for online stockists and this came up immediately so i don't think it'll be too difficult.
This is the link ......
http://www.floraselect.co.uk/shop/buddleja-__-buddleia--%7C22400/

On further investigation these haven't yet been dwarfed - and, the ones i've seen aren't this bicolour one at all, i'm sorry for leading you up the garden path.

Thats ok Louise. I thought you might have spottted something I hadn't!

If you want a reliably small Buddleia, go for Buddleia 'Buzz' (1 m x 1 m) and one even smaller is Blue Chip (also called Blue Clips)

But they're not bicolour varieties though :-/

True...

I have seen the buddleia buzz ........thats just the size I'd like but in the 'flower power' variety. At the moment I don't think it's available in the dwarf size. I went to a garden centre today and asked if they had the flower power buddleia......unfortunately they hadn't heard of it!!
I really appreciate all your replies, thank you very much .

I just had a good look at the Flower Power details - 2.4m is its eventual height, but as with other buddleias, don't forget you'll be cutting it down to within 2 inches of old wood in March every year, so it'll only be that size by autumn annually. Strangely though, I notice two suppliers (Parkers, Thomson and Morgan) recommend this pruning is carried out immediately after flowering, in September...