The message
from Steve Firth contains these words:

FWIW, prices have been dropping fast recently. I've picked up a 300 litre
20 vacuum tube unit for the tractor shed/store at the farm. We're
installing a bathroom/office at the back of the store and the only source
of hot water will be solar. The total cost of the unit + installation is
£700, cheaper than an LPG system.

Cor - got any more?

--
Skipweasel
Pay no attention to that man behind the curtain.