Ideas wise I rasied just over £9,000 doing John O’Graots to Lands End last year, was proper hard work, but a few things did help……
Cakes – we sold a shed load of cakes at work and to friends etc reckon we probably totalled way over £500 from this.(do it a long time before and you can get away with asking for sponsorship too!)
Speak to your local football club/ rudgby club – we went to Cardiff Citys ground and rasied money – colected over £1000 in about 45 mins.
We also did a sponsored ride at 3 of our sites across the coutnry where I got work to agree to giving people half a day off to join in if they rasied over £50. We did these rides on the way down from John O’Groats so maybe not doable in this instance but something similar might be?
A lot of our cash came from reaching a bigger audience, theres only so much you can blag off friends/ feel comfortable hasseling them!
Good luck though!