https://www.canada.ca/en/immigratio...ffices/international-visa-offices/london.html
use this link.
enquiries- web form - attach new pictures(make sure to include most that were clicked in public- like market, shopping, restaurant, with family members, guests,pictures of baby and dad to show their connection- add little description on side etc) from recent visit,boarding passes(your's n kids), passport page that has travel stamp,birth certificates, and if you or your husband has updated passports with spouse name will be good.
for details: - just write - adding some documents to our file (include file #, UCI#, Passport #(applicant's), date of submission, dates of travelling) for further reference.
Hope this thing will work out for you, it actually did for us.
good luck.