Thanks for the advice.
I'm sorry I wasn't too clear on the job transfer, you're right gbye grey sky, we are moving to Australia anyway. The transfer thing came about due to me being up front with my employer (and knowing full well they have an office in Sydney). I asked if there might be an opportunity for a transfer and they said maybe. So there is a verbal agreement that if the transfer comes off, they will pay a substantial amount of the cost. If not, we go ahead with the move anyway and I try to find a job.
I doubt if I could justify the agent fees in their cost if the move comes off, hence the unknown financial liability, it could end up costing us around £5k, around £3k or nothing depending on the outcome