Welcome to AoS Geoffrey.
Yes we frown upon 'hi fi snobbery', or any form of 'willy waving' here. It's all about getting the maximum enjoyment out of the gear you own.
I agree the BBC do a superb job in relaying the Proms. In my youth I used to attend the Proms every year, but had to be satisfied with the cheaper seats with their less than ideal acoustics. But Radio 3 provides a perfect balance, placing you in the best seats; even if you do loose out on the "I am there" experience.
Regarding the RFI from your laptop, are you not able to move the tuner antenna further away from the computer? It also sounds (sorry for the pun) as if your laptop does not comply with the European CE regulations on EMC/EMI.
Enjoy the Forum
Barry