We do the Xero bookkeeping for a small company (t/o c£400k), it's about 2 hours/week. They have asked us whether we'd make bank payments for them (c40 pcm, normally £100-£1k with a handfull of c£10k pa). Obviously I said yes - but what would you charge? Time? Per item? I'd prefer to fix so I don't have to edit invoices each month, but don't know what.
The last time that we did this was a few years ago. We charged £25/h for the bookkeeping & £50/hr for the payments - which was only about £25/wk!