https://dictionary.cambridge.org/pronunciation/english/jaguar
The main difference from 'American' is that we have the syllable pronounced 'yoo' in the middle and equally stressed with the 'Jag' and 'yoo..are' on either side. Having said that, when talking cars, 90% of Brits other than Jaguar car dealers (or buyers) simply refer to them as a Jag or Jags. (As in '.... always thought the E-Type Jag the best looking car of all time', same as the accessory wot we stick on the end of a cleaning rod).
Alinwa, how most of us in the UK say 'Lapua' is close to the rendering in the You Tube clip, but as in 'Jaguar' has a much more pronounced 'yoo' syllable in the middle sounding not only different to a native speaker's usage, but longer. (Also, some English-English speakers cannot leave an open 'ahh' syllable at the end of a word but invariably add the consonant 'r', so 'Lapua' becomes pronounced same as 'Jaguar'. ie Lap-yoo-are each with equal stress.
Some well known Brit (It might have been David Gilmour of Pink Floyd fame.) once said, "We English attend the finest schools in the world so we can learn how to mispronounce foreign words."