Immigration eliminated any goodwill between me and them* with their making filing of TM30 the problem of the extension holder despite the requirement for documentation from the owner, and refusing to process extensions without one. Filing as "Possessor", you are dependent on documents from a third party who may not want to provide them. If a Landlord hasn't filed then shouldn't it be the Immigration Bureau, a division of the RTP who goes after this lawbreaker? CW in fairness will apparently accept a lease and utility bills receipts for filing as "possessor" but it's not a given - agent wheedling required - they prefer the owner docs and that is what was required by an agent filing on my behalf. Another agent who did my TM47 at CW told me they need TM30 to do it.
It has also made moving apartments trickier - you can tell a Landlord that unless he provides the necessary TM30 docs you won't sign, but he still might waste your time with the old "I've been renting out for 20 years, you don't need a TM30"
*yes I know, they are probably not all that bothered.