Jack of All Trades.

In this he's on the dole, hungry and ready to do any job but quickly light-heartedly scams his way into society and a highly regarded position at a bank next to the beleaguered Robertson Hare. Here he invents a fraudulent business plan (Merrivale - you remember it surely?), the manager and chairman and another finance company are suck(er)ed in and it all snowballs from there. With of course a love interest as a dynamo.