In regard to your comment about pre sizing bets CambridgeAlex, he was 3 betting like 80% of the time, so wanted to keep it in that sort of range so that he could feel like he could 3 bet me, rather than me making it £20 /£25 and him having to feel like he has to make it £60 which i feel could put him off 3 betting...
in this case we need to 4bet.
Why?
if we open smaller the induce a 3bet we THINK, but are not sure we're going to get (so we can peel and play a bigger pot) surely we're better off just opening bigger, then when we get a caller the pots the same size? I don't get too much why we'd open smaller to induce a small 3bet we're vs an opponent to call and play a smaller HU pot when we could maybe play a bigger pot by openeing to £25 and getting two callers