Hi SEL
Here, We allow for the R22 $45.00 per hour rebuild / €25.00 per hour maintance (Sheduled & Unsheduled) / Fuel 8.5 US gallons (32 litres) per hour / Insurance €11,000 year.
This will vary depending on where your based (Im not sure about the cost's in the UK, I left about 4 years ago)