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Re: Highway, from looking at episode details on the BFI database, it appears many editions in the series filmed outside of the UK were produced by Channel Television - Ulster Television took care of programmes filmed in the Republic of Ireland (at least five of them!), and a Christmas special filmed at Disneyland in Flordia was made by Anglia; ventures into parts of the UK in the Big Five regions were produced by neighbouring companies - e.g. London-area editions were shared between Anglia and TVS, Bradford was produced by Tyne Tees.
There was a clip on YouTube at the end of the 1986 Christmas special, where the endcap was billed "An ITV Production" with the ten regional company logos circled around it, not sure if the clip is online anymore.
There was a clip on YouTube at the end of the 1986 Christmas special, where the endcap was billed "An ITV Production" with the ten regional company logos circled around it, not sure if the clip is online anymore.