Short term investment options

I've got some money put aside for a house deposit, this was previously invested in stocks and bonds. I recently decided that I would buy in the next 3 years and so I pulled the money out as I felt stocks were too risky over that short time frame. I've made my max pension contribution and ISA allocation for the year, so that option isn't available.

I'm now in a situation where I've got the money shared across the best savings products available e.g. 90 day notice accounts. Overall I'm earning about 1.2%.

I was wondering if there is something better that I could do. My main thought is would it be a good idea to look at a 100% bond portfolio? Or is that still too risky over a 12 to 36 month timeframe?