Synchronisers still didn't have the best reputations in the 80s did they though - as they knocked the edges off the pictures quite badly in some cases - so I can understand the LWT non-sync cut.
LWT used a couple of syncs. Questech something or others and Quantel DFS 1751's. The ITN would have had a local Quantel in circuit given the era.
Someone was out in the Europe somewhere covering football match with a 1751 which was pretty reliable apart from one of the input (or output) locking loops that used a particular diode that would fail due to heat eventually. When this chap went abroad with one he took a diode with him.
Out at the broadcast centre there were some Swiss chaps looking glumly at a 1751 synchroniser that was not working - unlocked pictures. The chap casually produced the diode from his trouser pocket, gave it to the Swiss chaps and said - you need one of these. The Swiss chaps changed the diode and of course it cured the fault. Great engineer, I would have loved to have been there!