Some elements of the low-cost model have been subject to criticism by governments and regulators; and in the UK in particular, the issue of "unbundling" of ancillary charges by both low-cost carriers and other airlines (showing airport fees or taxes as separate charges rather than as part of the advertised fare) to make the "headline fare" appear lower has resulted in enforcement action. Believing that this amounts to a misleading approach to pricing, the United Kingdom's Office of Fair Trading (OFT) in February 2007 gave all carriers and travel companies three months to include all fixed non-optional costs in their basic advertised prices. Although the full-service carriers had complied within the specified timescales, the low-cost carriers have been less compliant in this respect, leading to the prospect of legal action by the OFT.