Does anywhere sell long clip-on straps for bags?

[DrinkYourWeakLemonDrinkNow]

I've sent for a bag from Next but I just know the strap won't be long enough. Its a really silly length for the size of the bag (people in the 'customer feedback' have mentioned it too) but I think I'm still going to like the bag iyswim.

Any ideas where could I get another strap for it??

.

these any good?

watching with interest as i need long handles to go over the buggy .

That's just the thing thanks Madammecholet. I wonder if I can find a uk supplier.