There are quite a lot of shrubs across the block coming out in tiny white flowers. Before they flowered I had thought they were tea trees. When they flowered they had me stumped for a while but I eventually decided they are Bursaria Spinosa commonly known as Blackthorn and yes they do have thorns.
The funny thing is the poem I chose for this blog talks of the Blue Wrens nesting in the blackthorn and I wondered what type of bush it was - now I know. They seem to be a bit weedy but we will be keeping quite a few to provide a home for our little birds.