Hello John W
I am not surprised that Bailey did not issue a 'recall' notice, as such action is usually reserved for situations where safety is implicated. Most companies operate a range warranty or special service notices to cater for a range of product issues. These would generally fall into categories similar to the following:
1. Urgent Safety recall - where a condition has been identified that is likely to cause harm to persons during normal usage - or where a protective safety feature is known to fail operate correctly - or where a legal safety requirement has been breached. Personal letters and widespread urgent publication in newspapers, television etc of the recall notice would be justified.
2. Safety Recall - where under limited and unlikely conditions a product may be come harmful through normal usage. Personals letters, and publication of notice in Newspapers and magazines.
3. Urgent Service Notice - where a condition can arise with a product that is unlikely to cause a safety hazard, but will cause loss of use. - Personal letters, and service bulletin to dealers.
4. Special Service Notice, - Where a condition can arise with a product that does not have a safety implication, but will cause customer irritation. - Notice to dealers.
5. General Service Notice - Where a condition can arise with a product that does not have a safety implication, but will cause some customer irritation. This would also include any notices of new service techniques - Notice to dealers.
Whilst this list is not exhaustive, and as far as I know is not the specific model adopted by Bailey, the issue of ventilation boards would probably fall into category 4.
I did not see the item about and 18 year old caravan, but it is not really relevant to this discussion which is about Bailey's in second millennium designs. For you interest, by 1970 about 40% of new caravans were fitted with some form of heating, and by 1980 virtually all touring caravans had some space heating and about 60% had ducted blown air. In 1986 all but the base models had ducted blown air, so at 18 years old this van would not be exceptional.