Website JustGiving will take at least £115,000 in fees after an outpouring of charitable giving following the Grenfell Towers tragedy.

The donations, so far totalling £2.3m, broke previous records for the largest one-day sums given via the website.

JustGiving's fee of 5pc of any money donated - more than twice the fees of some rival donor sites - means it will get a bumper windfall.

The sums generated for the firm could be even higher, as JustGiving applies that fee to GiftAid donations too. GiftAid enables UK taxpayers to get tax relief on any charitable donations, with this sum going to the charity too. For every £1 you give 25p can be reclaimed.

On top of its 5pc fee the website also charges a 1.25pc "payment processing fee", reducing donations so far by a further £29,000. This increases to 1.45pc for anyone paying through PayPal, and is even more for those donating from overseas.

This means that for a £100 donation, with Gift Aid added, JustGiving will take £7.60 in fees.

JustGiving, a privately-owned business, said that it uses the 5pc charge on all donations to maintain the website and process GiftAid tax relief. It also gives free advice to charities on online fundraising and creating new fundraising tools.