asked Her Majesty's Government:

Which accredited companies have been approved to escort abnormal loads on motorways. [HL1181]

There is no formal accreditation or approved list for abnormal load escort companies.

Abnormal load escorts operate on motorways and other roads under a voluntary code of practice published by the Highways Agency and supported by the police and the principal haulage industry associations. The code is a statement of best practice designed to ensure that those escorting abnormal loads do so in a manner that maximises safety. A copy has been placed in the Libraries of both Houses.