I'm in SE6 and have about 8 ready to be rehomed (in pots grown from cuttings in the great strong air of the South Circular) and you'd be welcome to some if you decide replacement is what you want.
If you - or anyone - is willing to trade I have an Aussie bottlebrush? Actually there's two (left from a batch of a dozen) both a year and a half old. SE23 for ref
Thank you, will try this. One needs to move so that's probably the perfect time to dig an over-sized hole and give it loads of compost?