Some people consider the surprise of biting into a waferless KitKat to be a rare treat, but one woman is threatening legal action over a pack of the chocolate bars all missing their signature wafer.

Saima Ahmad, a 20-year-old law student from London, is demanding Nestle compensate her with a lifetime supply of KitKats over the error - or face her taking legal action.

The Kings College London undergraduate from Enfield, is claiming "monetary and emotional" loss over the incident and has tackled the confectionery giant with a letter quoting case law from the 1930s to back up her demand.

"They go about advertising the unique concept of KitKat, but I'm so disappointed by what I have purchased," she said.

Saima Ahmad with one of the offending chocolate bars Credit: SWNS

Ahmad bought a multipack of eight KitKats from her local supermarket for £2 last month, but was not impressed when she bit into solid blocks of chocolate.

"Clearly, if I wanted to purchase a confectionery item that is purely chocolate, I would have purchased a bar of Galaxy," she said.

"I wouldn't rule out taking this further if Nestle do not apologise or compensate me adequately."

She says a lifetime supply of the snacks "will do".

Ahmad has researched similar instances of waferless KitKats online.

"There are quite a few forums online where people complain of having KitKats without wafer," she said.

The student admitted she is "trying her luck", adding "if you don't ask you don't get."

The truth of the matter is; manufacturers owe a duty of care to consumers. An excerpt from Saima Ahmad's letter to Nestle

Nestle has yet to comment on the matter.