@HI-TEC99
Wasn't my thread mate but thanks very much. I had an inkling this was the problem but I was worried nevertheless. Should I keep the same client and wait, then update the programme I use, or get a new programme now and await for my BTC to return?
I'd install electrum and import your multibit private keys into it as explained in the post I linked to. Your coins will probably show in electrum, and if they do you can send them immediately.
Got my electrum wallet set up, imported the key and now I have 1.498BC unconfirmed, but the transaction has appeared on blockchain.info so I expect it'll turn up soon. Thanks a bunch for your time and help!