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.
For example:
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If you pledge £5
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You actually only pay £3.90
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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.