Hiya
On a push you can get up to 40 for a match
70 aint gonna happen unless the rate is a joke to start with.
One thing to be mindful is that the fixed rates do vary quite a lot between lenders, more so than variables do.
This means the rate that you will actually pay ( and the use you put it to) is likely to be more financially relevant than X points of y rate
ta
rolf