My experience of houses in Kent and Norfolk is that 30s and 50s council houses were well built; in fact, the thirties were the best of house building periods, and the 50s houses were not dissimilar. It all started to go pear-shaped in the later sixties with flatter roofs and areas of non cavity construction (usually facades). Can't say that house-building has improved, though insulation has.
Sorry Serge in my earlier post re lower power amps for the treble I forgot to mention that the treble portion of the crossover would need altering to reduce the attenuation to match the new treble amplifier. Thats why I said it was impractical in this case. Of course an active solution could well be superior. I was trying to highlight a case where bi-amping might be of benefit.
The total comes to £9.50 inc postage (probably send them separately to avoid the jewel case breaking).
My emails from last time see to be missing. Can't remember how you paid last time. Was is a gift payment or bank transfer?
Will also need your postal address again.