Air bricks cemented up!
The surveyor failed to note that both of my air bricks, in kitchen and bathrom were both in use, so when the man came to carry out the insulation he cemented up both air bricks! I contacted Dyson as soon as I noticed this and within a couple of days they sent a team out to replace the air bricks. Everything was dealt with very quickly, politely and proffessionally but shouldn't have been missed in the first place, hence 3 stars.