Anchoring describes the behavioural effect whereby the first figure, proposal or frame put forward exerts disproportionate influence on later negotiation, valuation and decision‑making. In legal practice across England & Wales, Scotland, Northern Ireland and Ireland, it is a descriptive term (not defined in legislation or case law) used in settlement negotiations, mediation, Part 36/Calderbank offers, pleadings of sums, and submissions on damages or sentencing. Practitioners deploy anchors to shape the bargaining range; opponents seek to neutralise them with evidence and objective benchmarks.Courts and tribunals recognise the risk of unfair anchoring and rely on structured guidance to promote consistency: the Judicial College Guidelines (England & Wales), the Judicial Studies Board Guidelines (Northern Ireland), Scottish case law with reference to the Judicial College Guidelines, and the Judicial Council’s Personal Injuries Guidelines 2021 (Ireland). Over‑ or under‑anchoring can have costs consequences where offers are unreasonable.Do not confuse anchoring with the “anchor defendant” or “anchor claim” used to establish jurisdiction or service out (for example, the “necessary or proper party” gateway in England & Wales, similar concepts in Scotland, and Article 8(1) Brussels Ia/Brussels Recast still relevant in Ireland). In consumer and competition contexts, “price anchoring” (reference pricing) may attract scrutiny under the UK Consumer Protection from Unfair Trading Regulations 2008 and Ireland’s Consumer Protection Act 2007.