Britbox review: Bait and switch

So you pay a premium price for the streaming — only to find they withhold episodes — say -#5 and 6 and tell you only way to watch is to upgrade to higher plan for additional $40. You can wait it out on the standard plan, but who wants to do that.
I like Britbox, but am glad I only signed up for one month at a time — am cancelling — too many other options out there!
Should be a disclaimer in the subscription detail.