Help! Just Moved In - How Do I Turn the Hot Water On (Hive)?

[Octoposse]

Apologies for idiocy . . . but I'd rather appear an idiot here than to my wife and nine year old when they get back from the school run with first night takeaway treat . .

Moved in today. Have gas and power but can't get hot water. Worcester boiler, newish, with hot water tank.

Seems to be a Hive equipped house.

Old fashioned immersion heater switch in airing cupboard, but doesn't do anything apparently except light up, so I wonder if redundant now.

Clever digital display in kitchen that helpfully tells me we've spent 70p today, and some sort of controller in the living room with a knob. Bizarrely the power shower doesn't want to give me hot water either, but that could be broken by coincidence.

All I want is hot water . . . suggestions?

[Octoposse]

On mobile data (BT engineer for broadband next week) so couldn't download manual).

Middle menu button just elicits 'Receiving' then 'No Signal'.

[Octoposse]

Progress! There was an isolator switch to the boiler, hidden behind removal boxes!

Now I'm up to here . . .

[Octoposse]

Woopy-do - controller now says Hot Water On!

Thanks guys - I was over complicating the problem!

[Octoposse]

Thanks - I'll talk to British Gas tomorrow. We'll be going with Bulb (I assume).