Localgiving is an online donation site, which unusually allows groups which aren't charities (but have charitable objects) to claim Gift Aid, the refund of income tax on donations. This can paticularly benefits smaller community groups. There is a cost to join, and a fee taken from donations, but if you regularly receive online donations it could be very useful.
They are starting a campaign on 14th October where donations up to £10 will be matched by them. This means that taking Gift Aid and fees into account, every £10 donation will be worth £21.55 to you. All charities with active memberships are eligible to receive match funding, with up to £12,000 available for each group (depending how long the money lasts)
For Sheffield groups, there is some money available to cover the membership costs. Email South Yorkshire Community Foundation for information about this on grants@sycf.org.uk
Details of Localgiving here:
localgiving.com/gyt/about