You can find the equipment carriage requirements in each country's AIP ENR 1.5.
Every one I have looked at requires DME.
Some require an ADF, but not many, and I don't think any of the new JAA members have bothered for enroute IFR. For flying an NDB approach of course, and there are plenty of those all around Europe.
I have not seen any evidence that anything will change on this front. A lot of talk and rumour (as always in this business) but nothing is actually changing.
The UK might remove the requirement for enroute but that still leaves the rest of Europe, and screws you on legally flying NDB approaches everywhere.
Lots of airports are say VOR/DME and NDB/DME and if the VOR is U/S then you have to use the ADF. Personally I would regard a plane without an ADF as close to useless for IFR.
Most pilots fly NDB approaches primarily using a GPS (with a quick ADF check at the FAF, say) which is obviously the safest way but that's not the point
I would also say all of the above for flying around the UK with the IMC Rating.