You might also like to consider Payroll Giving (Give As You Earn). This is a really efficient way of supporting Aspire whereby your donation is taken straight from your salary before tax - Aspire therefore receives more money at no extra cost to you.
If you pledge £5
You actually only pay £3.90
The taxman will add 22% - £1.10
If your company operates a Payroll Giving scheme (and if they don't, why not persuade them to start one?) then simply complete a Payroll Giving Form and return it to your payroll department.
Don't forget that if you are a UK tax payer, using Gift Aid means that for every pound you give, we get an extra 25p from the Inland Revenue, helping your donation go further.
Download a Gift Aid Form here.