In the UK, as long as you are able to track your finances well enough to ensure you repay the balance in full each month (you can arrange for this to happen automatically), there's no reason not to use a credit card.
You should especially use it for purchases over £100 as by law card issuers are jointly liable for problems with goods purchased, so if I have a warranty issue the retailer won't help with I can go through section 75 with my bank
I have never purchased something on a credit card and had it on the balance long enough to pay interest though, the rates are insane.