Buying out of a mortgage

Hi all, I'm just about to buy out of a £362k mortgage at 4.59% (it's in the last year of that rate) to move to a 1.79% fix and was wondering on opinions as to whether or not a rate of 1.79% is likely to be bettered in the (very) near future. LTV is just under 60%, the borrowing is on the edge of affordability but I could manage with a new mortgage of £340k or so.

Thanks in advance.