The difference is that the UK's devolution is (in comparison) well-planned and well-executed...
I am Welsh, and I am a big fan of devolution. But an important principle in devolution is that of accountability. The Welsh Government is accountable to the individual voters of Wales, but they are also accountable to the UK Government since they are still reliant on the UK for many things (some funding, defence etc).
It remains the case that the UK Parliament is sovereign over the regions, but that convention requires that the devolved assemblies are allowed to control all legislation within their devolved matters. If the Welsh Assembly decided to pass a law banning the English from crossing the border, the UK parliament could (and would) overrule them.
In the BCA, not only do each of the (not individually democratic) regions get positions on BCA Council and every Standing Committee, the BCA is also constitutionally barred from interfering in access matters. So essentially the BCA coughs up the cash, the regions spend it (fairly freely, since some expenditure is automatic and they control the committees that approval exceptional expenditure e.g. C&A and E&T), they can vote on BCA matters and interfere in BCA matters but the BCA is not allowed to interfere in regional matters (despite being the more democratic body).
The BCA's set-up is not devolution, which has a clear hierarchy where the regional assembly is subordinate to the national government (although the national government should not interfere without exceptional reasons). The BCA is the single national democratic body shackled to the independent regions who can freely drag the BCA where they see fit while collecting the benefits of the BCA. Fortunately, most of the regions, most of the time, work for the benefit of caving (probably they always all _think_ they are working for the benefit of caving...).
In my eyes, it is a travesty that individual cavers (i.e. cavers outside of a club, or those that are not represented by their club's voting habits) have effectively no democratic say on access issues in UK, since this is the remit of the regions, and if a region decides on a policy the BCA cannot intervene.