So I downloaded the official Electrum, copied the address from the receive request generated. added that to Kraken to download the btc.
I waited and waited and nothing happened so after advice I checked that address in the list of addresses in Electrum (33 of them) and that one doesnt appear anywhere so;
where has my btc gone, where has that address gone? is all lost? sorry my first transaction!
Looks like the Bitcoin you sent didn't make it to your electrum wallet. This happens sometimes due to technical errors or maybe you should check if you're using the right Electrum version. There are a lot of fake versions out there and if you're unfortunate to have downloaded one of them then this is bound to happen.
It could also be that you may have sent the Bitcoin to a wrong address, even if you copied and pasted the address, it's possible that you may have pasted the wrong address.
It's also possible that the transaction might still be pending, so you should check the status of the transaction, if it's still pending, then it may take a while to reach the recipient wallet but if it's confirmed, then the Bitcoin should definitely be in the correct recipient wallet.
It's also possible that Kraken might be experiencing a bit of a technical malfunctions, which may be delaying your transaction. Its also possible that something else is wrong but ill advice you go with these options first and see how it goes.
Best of luck.