We use both SynerJy and Eurocell Windows:

Windows are such an important part of your home, the choice you make is not only
aesthetically important but also their effect on the environment, and of course will
they keep your warm...

SynerJy 

Responding to what our customers say they would like whilst simultaneously handing
them a completely fully sculptured window, door, and conservatory suite. The 2005
launch of the SynerJy window and door suite celebrates 15 years of PVCu window
and door profile systems from Synseal. As Synseal has evolved so have the products,
each  drawing on the experience of the previous generation and the ever changing
customer requirements.

The most signficant development in SynerJy is the introduction of a J bead
(also known as a knock in, or single leg bead), responding to what our customers say
they would like whilst simultaneously handing them a completely fully sculptured window,
door, and conservatory
suite.

Eurocell 

UPVC Windows, UPVC Doors, Conservatories, Composite Doors, UPVC Soffits and Fascia

Eurocell is the UK's market-leading manufacturer and distributor of quality UPVC profiles
for UPVC windows, UPVC doors, UPVC conservatories, UPVC fascias, UPVC soffits, UPVC
guttering and rain water systems.

We supply UPVC products to thousands of window, conservatory and door fabricators,
installers, builders and roofing contractors across the UK. Eurocell is part of the Tessenderlo
Group, a multi-billion-pound global plastics and chemicals group. This ensures we have
the resources and expertise to deliver the quality building plastics you require.

Our precision-manufactured UPVC products provide a complete one-stop-shop solution
for many industry sectors including house builders specifying new build projects, local
authorities, social housing landlords refurbishing housing stocks, homeowners wanting to
add value to their properties. 

Tilt and Turn Windows are ideal for those out of reach windows to clean them, you
simply do as the name suggests and they are easy to clean.

We use a reinforcing PVC-U window profile which is the most cost effective and energy
effective option. It makes use of Thermalogik windows these are known for their thermal
efficiency see below for examples of how this works:

The six chambers below make sure the heat stays in not out