Savings/Investments advice

[HughS47]

Mrs S47 has changed jobs and is keen to squirrel away £200-£400 per month for our next big house deposit (rather than use it to overpay the mortgage). What is the easiest/best way to invest/save this cash that offers interesting returns? We're total amateurs when it comes to this so any advice is welcome! I appreciate that a decent high street bank savings account is very easy, but doesn't necessarily maximise our money over 2-3 years (rough timeline)