Another really basic question from a newbie...
After experimenting with small amounts, I purchased some BTC with the intent of just holding on to them over an extended time period, stored in several paper wallets, now sat in my filing cabinet.
I now read of various forks, including the Segwit2x later this month. So my question is, without really understanding the fork process, will my existing paper BTC wallets still be valid in several months/years time without the need to do anything, when I decide to exchange/sell these back to my local currency, GBP?

As a newbie, I'm trying to sweep my first paper wallet into Electrum, through the menu: Wallet / Private keys / sweep
I enter my private key 5Kj....etc, no spaces, checked the number numerous times, it is correct, but I just get the message:
No inputs found. (Note that inputs need to be confirmed)

What am I doing wrong? It must be something obvious!!

I've just created my first paper wallet, and purchased a small amount of bitcoin to test the process.
I first printed off securely a paper wallet, that provided a public and a BIP38 secured private key.
I then purchased the bitcoin mBTC and deposited that using the public key.
I checked that the bitcoin had arrived at my public key address.
I then tried to reverse the process, so first decrypted my private BIT38 key and found that the decrypted public key was different to the initial public key I had used for the deposit !
Is this normal? Can different public keys still point to the same private key?
If I then deposit more coins into the now different public key, will the deposit still end up in MY same wallet?