My daughter bought me some for part of my Christmas present last year and it was something to look forward to when the spring arrived. Below is my top five sites for afternoon tea vouchers.
http://www.afternoonteafortwo.co.uk/ they call themselves the UK’s largest afternoon tea gift site.
http://www.buyagift.co.uk/Days-Out-Afternoon-teas-BN-11wZw4.aspx?cm_mmc=google-_-Days%20Out| they also have a large selection.
http://www.pamperingdays.com/afternoon-tea/ – this one could be included in a day at a spa