Purplebricks’s core UK business is still growing and remains profitable with instructions up again in the last year.

But, says portals analyst Mike DelPrete, the more difficult market is causing mounting headwinds.

While instructions rose, the rate of growth is still impressive but has slowed and the UK finances have taken a hit in the second half of its financial year – last December to this April.

Compared with the first six months, marketing costs were steady while revenue dropped £6.5m.

DelPrete says: “With a soft property market in the UK, at least partially driven by the uncertainty around Brexit, it is becoming more difficult and expensive for Purplebricks to acquire customers.

“For the first time in its history, Purplebricks customer acquisition cost (or cost per instruction) has increased from the previous year.

“The trend of increased economics of scale has taken a pause – perhaps temporary, perhaps not.”

DelPrete concludes: “Purplebricks’ continued – albeit slowing – growth in the UK highlights the importance of customer acquisition costs in the new world of hybrid and online brokers.

“Having fantastic technology and a great team will only get you so far; at the end of the day, massive advertising expenditures are required to reach scale, and then, profitability.”

Meanwhile in Australia where Purplebricks is winding down its business with the aim of a total exit by the end of the year, it is separately reported that there are now just 182 listings, compared with 800 back in July.