What's the split on the 580k? Lets say its 260k highgate 320k dianella? Then 60% x 260k + 90% x 320k = 444k worth of borrowings minus 376k already got leaves around 70k to spend. 10% deposit on new purchase at 350k = 35k deposit + 10k stamps + 10k lmi = 15k buffer left over.
Dont get another...