Your best bet may be the Hamburg Passenger Lists, on Ancestry:
https://www.ancestry.co.uk/search/collections/1068/However, they are written in German, the indexing is shockingly poor, and not everyone from Lithuania will have used that route.
As has been suggested above, seek them first in an earlier census.
Try looking for them in other resources too, to narrow down the dates – birth records for any children born in the UK, naturalisation records, newspapers etc.
If you post some details, people may be able to help you search.