Should I charge for looking after my neighbours' pets?

[CoeRoe]

My neighbours have two rabbits, and they asked casually, if they were ever away for the night, would I look after them. I said yes.

Two days later they put their key through my door with a note saying they'd be away for a few days. Three days after that, I called them to let them know the rabbits were ok etc, and they said I could watch their TV (more channels than me), help myself to food and drink (which I don't want), but didn't mention when they'd be back.

Four days later (a week into looking after the rabbits), I texted asking when they would return. I received a text back 11 hours later saying they were sorry, they'd be back 2 weeks after they originally left, and they'd give me cash on their return.

I've been checking the pets each morning, and spending around an hour each evening letting them run around, and changing their litter tray. I've had to top up the neighbours' electricity meter and buy food etc for the rabbits. This isn't easy as I'm skint just now and have to watch literally every £1 I spend.

Should I see what they offer me when they get back, or should I tell them how much I want ie refunded my costs and paid an hourly rate? (If I do this it will be around £100 total which is far less than local petsitting services)?

[CoeRoe]

@ Wendilla - they gave me their number on the note put through my door. I assume they left during the day when I was at work (they could have got my number from the landlord but didn't). Re the elec meter - I'd never seen one that took coins before I moved in - it's good to not get a bill each month but a real pain trying to make sure I have £1 coins!

[bushbaby_de]

I'll give you £20 for the bunnies and will make an array of dishes to share with my fellow ABers.