Follow Form — when an umbrella policy provision follows the underlying policy as to how the provision applies. Follow form also identifies an "excess" liability policy that follows the underlying policies for most policy provisions.
Source: International Risk Management Institute, Inc.
https://www.irmi.com/term/insurance-definitions/follow-form

Excess Liability "Follow Form" Policy — excess insurance that is subject to all of the terms and conditions of the policy beneath it. In the event of a conflict, it is the underlying policy provisions that take precedence.
Source: International Risk Management Institute, Inc.
https://www.irmi.com/term/insurance-definitions/excess-liabi...
Form — a document prepared in a prescribed arrangement of words and layout. A rider, policy, endorsement, or application—all of these are forms.
Source: International Risk Management Institute, Inc.
https://www.irmi.com/term/insurance-definitions/form
Nota: Hay que traducir toda la expresión:
Policy Wording: LSW 055 Excess follow form, as attached, plus
LSW: Lloyd's standard wording
Texto de la póliza: forma subordinada de exceso de pérdida LSW 055

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Note added at 5 hrs (2021-06-11 18:07:36 GMT)
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Fuente de expample sentence: El contrato de seguro y los contratos de la actividad financiera:
Coberturas y tendencias del seguro global bancario*
Jorge Eduardo Narváez Bonn et**