Jeff Howell advises readers on how to choose between roof insulation and downlighting, and warns about being ripped-off by roofing contractors.

Which means grants for combi-boilers, roof insulation, double glazing, solar panels, where is that funding going to come from?

The Haarlem produces narrow fabrics, while the Speedwell produces cavity wall and roof insulation.

Improve thermal efficiency of the roof insulation; this is because as temperature increases, the thermal conductivity of the roof's insulation also increases.

There may be additional things you can do - such as installing double-glazing and improving roof insulation - to help make buildings more airtight.

The roof insulation goes right up to the peak, with a vapor barrier under the insulation, then gypsum board covering this.

Use the money to provide grants or subsidies for domestic solar panels & roof insulation for households across the UK.

The museum improved its roof insulation and glazing and, like Hall for Cornwall, altered its building management systems to cut unnecessary heating.

How do I choose between roof insulation and downlighting?

The work will include cavity wall insulation, roof insulation, double glazing and installation of energy efficient heating systems.