For a traditional English breakfast at reasonable prices near an Elizabeth Line station in London, Polo Bar stands out as the most reliably documented option. Located opposite Liverpool Street station, this 24-hour café has operated since 1959 and serves full English breakfasts at budget-friendly prices [1]. The Paddington station area also offers multiple casual cafés serving traditional fry-ups at modest cost, making it a practical choice for commuters [2].

Beyond these two anchors, the panel encountered significant verification challenges. Gemini 3 Flash cited numerous specific venues—Riccardo's Cafe, Mad Bishop and Bear, Cafe Dylan Dog, Billingsgate Cafe, Salt and Pepper, Sofra, and Regency Cafe—with detailed addresses, hours, and prices. However, Sonar and GPT-5 Mini could not verify most of these claims against current sources. The Breakfast Club does have documented locations near Elizabeth Line stations and serves full English-style breakfasts in the £8–£15 range [3], and Regency Cafe near St James's Park is acknowledged as a genuine historic venue known for affordable breakfasts, though exact current pricing could not be independently confirmed.

The core reliable guidance is: Polo Bar (Liverpool Street) and Paddington-area cafés are your safest bets for verified, affordable traditional English breakfast near Elizabeth Line stations. For other specific venues mentioned—particularly those with precise addresses and hours—you should verify current opening times, menus, and prices directly with the establishment or current restaurant directories before visiting, as London's café landscape changes frequently and online information may be outdated.