Hi Anonymous,
the options that do not require other languages besides English in Europe are normally the UK and the Nordics only. It could be difficult to land an invitation in these countries without a referral, as (i) they are targeted by many people who focus on English speaking countries only and (ii) you may not be physically present in these regions nor have work experience there.
As a consequence, I would structure the application process as follows:
STEP 1: Polish your CV and Cover
STEP 2: Find a good referral in the geographies interesting for you
STEP 3: Apply via referral only
For what concerns referrals, you can find some more information at the second post I wrote at the following link:
https://www.preplounge.com/en/consulting-forum/open-house-at-bcg-311
Hope this helps,
Francesco
(edited)