I have just been on a dance holiday to Spain, and to take good dancing photos a compact, no matter how good, just isn't fast enough so that meant taking my dSLR. Much as I love my 10-22 & 24-105 I just didn't want to carry the weight. I thought about buying an 18-55 but felt it might not be wide enough at the short end or long enough at the long end. The newish 15-85 gets great reviews but £580 for a holiday lens

... then somebody suggested hiring one.
So I went to
lensesforhire.co.uk £39 + p&p for the week ... and that really is a week - the lens is delivered the day before you need it, and you send it back the day after you need it. Their service was spot on, I needed to change the deliver address at short notice - no problem at all. Lens arrived on time, well packed, good condition, with instruction and full return packaging including address label. This company is a joy to deal with and their prices are very competitive as well
Strongly recommended