Openreach does not charge end users directly, they charge service providers i.e. the company you pay for your voice service or DSL service - or the company your provider buys services from (reseller).
Your SP charges you - the criteria used to pass on (or not) charges differs between SPs.
It's a complex market - some providers of services have a direct relationship with Openreach, others resell products of those direct providers, others resell products of those resellers and so on.
The resold channel is 4 or 5 tiers deep in places as the VARs (Value Add Resellers) get involved - these are the guys that bundle up your voice, data, VPN & IT hardware needs into one price point. This seems bad in that it removes you further from your actual underlying connectivity provider. Then the bean counters take a look at how the sums can be pushed into capex and the tax advantage of putting the whole deal on finance and offseting the interest against taxable profit.