Cycle 20 flagged the Wirral hypothesis as a priority cycle-21 audit: FC368 at CH41 2PH posted £177,842 inside the Liverpool L1 3-mile ring — the single highest-earning Boots branch in the L1 catchment, beating every Liverpool city-side branch by roughly 2x. The cycle 20 framing: a dedicated Wirral 3-mile audit would almost certainly post the highest Boots operating average in the English atlas, above Plymouth PL1's £150,572 leader.

The cycle 21 audit settles the question. A standalone CH41 2PH 3-mile ring returns 12 Boots contractor codes, 6 operating, 6 ghost — a 50% ghost rate. Combined operating revenue averages £102,958 per branch — below Plymouth PL1 (£150,572), below Wolverhampton WV1 (£137,266), below Newcastle NE1 (£132,785). The hypothesis is falsified at ring level. At branch level, FC368 itself remains the atlas single-branch leader for its catchment — but the wider 3-mile Wirral ring's Boots estate averages on the weaker side of the atlas.

The 12 CH41 3-mile Boots branches

Six operating branches, six ghosts. The 50% ghost rate confirms Wirral sits in the half-closed cluster PharmSee identified in cycle 19 (Plymouth, Leeds, Liverpool city-side, Newcastle, Wolverhampton — all at 40-57% ghost). The CH41 ring caught the same 2023 rationalisation wave as the broader Merseyside corridor.

Why FC368 is the atlas-exceptional outlier

£177,842 is the top Boots operating revenue in any Wirral or Merseyside postcode PharmSee has measured. The next Wirral branch (FYV68 at CH44 5TP) sits at £105,709 — a 41% gap from the leader. Within the CH41 ring, FC368 sits alone at the top. The catchment it serves is the Birkenhead central retail spine, directly opposite Liverpool across the Mersey. It captures a mix of:

1. Wirral-side residents who refuse to travel to Liverpool for pharmacy
2. Commuters coming off the Queensway Tunnel, the Mersey ferries, and Conway Park station
3. Half a dozen NHS service contracts co-located in CH41 health-corridor premises

£177,842 is consistent with a single-branch Boots catching roughly 2x the Liverpool city-side operating average (£83,567). That makes FC368 one of the atlas's structural outliers: a single branch at the cross-river trading boundary between two large catchments.

Why the ring average is only £102,958

The ring average is pulled down by:

• Five sub-£100k operating branches (FYV68, FY215, FF015, FL617, FXV39). These are standard Wirral retail-corridor branches with no cross-river commercial advantage.
• Two L1-postcode branches caught in the CH41 3-mile ring (FF015 and FXV39). Both are Liverpool city-side branches, not Wirral — they slip into the CH41 3-mile catchment because the geographic ring crosses the river.
• Six ghost branches pulling the "count" half of the branch average down without contributing revenue. If we were computing revenue per contractor-code the average would collapse to £51,479.

The cycle 20 hypothesis that Wirral retail-park economics would top the atlas assumed the ring would be Wirral-only with primarily retail-park branches. In practice, the 3-mile CH41 ring catches (a) half a dozen Wirral city-edge branches at middling revenues, (b) two Liverpool side branches below average, and (c) six ghost codes — producing an average below the half-closed cluster cities.

Retail-park vs city-centre intra-ring split

Within the Wirral ring we can partially separate retail-park economics from city-centre. FC368 at CH41 2PH is central Birkenhead retail. FY215 at CH63 7PG is the Bromborough retail-park cluster. FYV68 at CH44 5TP is Wallasey/Poulton. FL617 at CH43 9SE is Oxton residential/retail. There is no strong "retail park > town centre" premium visible in the data — the top branch is town-centre, not retail-park. Intra-ring format variance is smaller than cross-ring variance.

The next-cycle test would be a CH63 5-mile ring centred on Bromborough to isolate the retail-park Boots at an average rather than through a ring that mixes formats. PharmSee will run that in a future audit.

What Cycle 20 got right and wrong

Right: FC368 is indeed the L1-catchment Boots leader, and the Wirral side meaningfully pulls Liverpool L1's cycle-20 £102,970 operating average up. If you remove FC368 and FYV68 (the two Wirral-side branches in the L1 audit ring), the Liverpool city-side Boots operating average drops to ~£83,567, roughly 19% below the mixed figure. The cycle 20 "cleaner framing" of "Liverpool city is Boots-weak like Leeds/Birmingham; Wirral is Boots-strong like Plymouth" holds for the two city-side branches it was making the claim about.

Wrong: the wider 3-mile CH41 ring does not produce atlas-leading averages. Wirral Boots is a mixed-signature estate — one exceptional branch (FC368), one strong branch (FYV68), four middling branches and six ghosts. The ring average sits in the mid-atlas band, not at the top.

Lesson: single-branch outliers like FC368 should not be projected to ring-level averages without auditing the full ring first. This is the third outlier-projection correction PharmSee has logged in cycles 19-21, and it is now the recommended standard for all atlas extension queries.

The Wirral ring ghost geography

Three ghost branches cluster in CH41/CH42/CH43 — the central Birkenhead postcodes. Two ghost branches sit on the Liverpool side (L2 and L3). One ghost sits at CH49 7LP, the Upton/Woodchurch corridor. The CH41/CH43 ghost cluster is consistent with the 2023 Wirral rationalisation: Boots closed roughly half its Birkenhead-core estate and retained FC368 as the surviving flagship plus FL617 (Oxton) and FK272 (now a ghost at CH42 2AT — Tranmere) as the sister branches. The survivor pattern closely follows the single-branch-catchment survival rule: branches with no 0.5-mile sister survived; branches within 0.5 miles of a sister rationalised one or both.

Related PharmSee

• Liverpool L1 Boots 12 branches 6 ghosts ratio correction (cycle 15)
• CH41 2PH Birkenhead Boots £177,841 leader (cycle 18)
• Boots estate bimodality — three clusters (cycle 17)
• Wolverhampton WV1 Boots 57% ghost rate deep-dive

Sources

• PharmSee location analyzer, CH41 2PH, 3-mile ring, 2026-04-11
• NHS Digital pharmacy contractor register (NHSBSA open data)