You shouldn't believe everything you read on the Internet
If you've got documentary evidence of everything you allege together with evidence you have mailed the letters, I'd simply hit them in the small claims court for the £40. A letter from a court is always more likely to get an airline's attention than a letter from a disgruntled customer.
slim_slag Can I assume from this you think I am making this all up? Please clarify.
Can I put an American (Houston) address in a UK CC claim?