how do eradicate damp and mould

Absolutely correct that the problem is ventilation. I would be very wary, though of the air-brick/trickle vent path. I see plenty of properties where there is mould growth around air bricks that have been installed in trying to counter a mould/condensation problem. The advice re a condensation control unit is almost certainly the most likely to improve the situation in a cost-effective manner. There are many types on the market and it's a bit of a case of you get what you pay for. They do run 24 hours a day so reliability and longevity are important, as is a high efficiency heater integral heater for domestic installations. You may or may not need to support this with improved kitchen/bathroom extraction. Look up Positive Input Ventilation on Google. The Heat Recovery solution is the ultimate but is usually most suitable in properties being built or refurbished to high insualtion/air leakage specifications. Again, you typically get what you pay for. The better units are typically 'SAP' rated - which can be looked up online. However, the differences in heat cell efficienncy are diminishing all the time. The features and, perhaps, 'specific fan power' are more important, but over-riding everything is the quality and design of the installation since minimising losses and resistance in the ductwork are the key to a successful installation.

I've lost count how many times i've answered questions similar to yours...............Ventilation is the key here. Look at installing air bricks on your walls and/or trickle vents on your windows. If your sliding door wardrobes are built in on an external wall,you can have a couple of air bricks fitted from the outside and then cut holes in the backs of your wardrobes and then fit vent covers over them. Carl.

Hi, Ventilation is the key. You need a continuous flow of air circulating. A condensation control unit fitted into the landing ceiling is the most effective way. You can have these fully installed for approx. £500. They are very econonomical to run and are silent during operation. Once installed they circulate air to all rooms, not just the area where it is installed. Jackson Construction.

Hi Morton Look into Heat Recovery Systems! You can have a single unit fitted in a room or a home unit that can control condensation issues throughout your property. These have a heat exchanger and it pulls the musty damp air out and pulls clean filtered air in through a fan system and it warms the clean air that is being brought in. Single unit with fitting can cost between £500 and £600. Scott Cannon.

As Carl has said, ventilation.