Brexit's Economic Toll & the Re-engagement Gamble

connectrealdots.com THU, OCT 8, 2026

OBR LONG-RUN TRADE LOSS

4–5%

estimated reduction in UK trade intensity from Brexit (OBR)

FINANCIAL & PROFESSIONAL SERVICES SHARE OF UK GVA

~12%

financial & related professional services — entirely excluded from the TCA (TheCityUK / House of Commons Library)

TARIFFS ON GOODS

Zero

TCA delivers zero-tariff, zero-quota goods trade — but non-tariff barriers remain

TCA EFFECTIVE DATE

Jan 1, 2021

UK formally left the single market and customs union

ACTUAL (ONS)

COUNTERFACTUAL (OBR)

BREXIT GAP

OBR-modelled trade intensity index (goods + services), 2018 = 100. Gap between lines represents the estimated structural trade loss attributable to Brexit.

KEY QUESTIONS

The OBR's 4–5% long-run trade intensity estimate represents a structural, compounding drag — not a one-time shock. The TCA's zero-tariff headline covers approximately 20% of UK GDP (goods); the 80% services economy operates without any EU framework.