For classical music listening, I would suggest an Arcam A19 or Rega Brio R or Creek Evolution 2.

Not knowing the prices in the UK I am not sure how those fit your budget.

If those are all too expensive, then the Cambridge 651A might be the next best thing.

The BX-5 speakers should be very nice to listen to with the right amplifier.

Their main limitation will be the lack of really low bass, but for most listeners their bass will be quite adequate.

The specification given of going down to 36 Hz is really not credible, but i am sure that they go down to almost 40 Hz.

You can only get so much bass out of most 5.5 inch drivers.

To get really low bass (otgan pedal notes etc) it really takes a subwoofer in any case.