Only if you still have the private key for the address that the 0.14 BTC is currently attached to.
In Bitcoin Core, if you goto "File -> Receiving Addresses"... do you see the btc address with the coins? Alternatively, if you use the "dumpprivkey" command from the debug console ("Help -> Debug Window -> Console")... does it output the private key for that address?
If it doesn't, then there is a chance that you no longer have that private key in your current wallet.dat file. Do you still have a copy of the original wallet.dat file backed up?
I tried the dumpprivkey command but again no luck. Yes, I had a backup but again its not showing up, from what i read this shouldn't be able to happen, so its very concerning that it has. Bitcoin Core started playing up just before it happened, which has probably caused it, but still dont understand how it could wipe the privatekey. Anyway, thanks for your help with this, if you have any other suggestions i'd love to hear them, but I'm very aware that its probably gone forever now.
Thanks again
Chris