Au pair pay

[sunnymum77]

Our au pair thinks that our pay - £100 a week, for 35 hrs a week plus babysitting, is too little. Au pair world says that babysitting is included (once during the week and once at the weekend), and that pocket money on average is £75-80 for 30 hrs a week. She is leaving in 3 weeks...do I up her pay for the 3 weeks, or just say that's the way to is? I had set out all the detail before she arrived, but she has been apparently told by other au pairs that the norm is £140 a week, and that we must add her hrs of babysitting. When she babysits I usually put the kids to bed and she sits in her room relaxing and doesn't have to do anything when we are out. On the odd occasion, she puts them to bed.
There have been several weeks when she has worked less, for example if I have been off work or we had family help, and we still paid her the full amount.
Views please!?

Following - I'm interested to know what is seen as reasonable for 3-4 days drop and pick up from school (5 hrs) max 30 hrs a week but likely closer to 20hrs a week. We live in croydon south London. Will pay her travel for transporting kids. Haven't thought as far as paying for mobile. Any 2017 recommendations? I have one friend who went through an agency paying £140 a week and another who is looking to pay £90 a week. One Aupair asked for £200 a week as it's 2 children (6yrs and 3yrs both in school/ nursery) - that's > tax threshold so would need to pay NI etc.

We haven't had au pair for the past three years, but before that we always paid 80 GBP for 25 hours plus 1 evening babysitting. We also allowed the use of car (petrol paid by us), paid the first 300 pounds for language classes and first mobile card topped with 20 pounds to give them a good head start. never had any complaints. we do live in central London though.

I was an au pair back in 2012 (wow long time), I worked 35-40 hours (staying home with toddlers - very long days) and got £70 per week which was pretty standard back then. The family lived an hour train ride from London so all my money went on transportation during the weekends, wherever I wanted to go I had to take bus/train. Londoners are in a massive advantage in those terms.
I don't know how it is now but back then au pairing was solely about exploring the country and learning the language - none of us thought about it as a proper job (not meaning we didn't work hard of course). So no one really thought about saving up pocket money or trying to stay in the country. This was my friends though- most of us were 18-19 year old Eastern Europeans (I was still im high school when I went, did the whole summer), so to be fair we were not bothered about the pay. But i'm sure even back then not everybody had this mindset.