[mlyle]

> take the remaining £60 to a blackjack table

Of course, "take the remaining 60 pounds" is ill-posed; what does that mean, make 60 bets of 1 pound and stop? Play a single 60 pound bet hand? Because that's the conditions under which you could expect to bring 60 and typically leave with ~54.

If you show up with 60 pounds but bet well over 60 cumulatively you're going to end up with much less.