42000 divided by 12 = £3500 a month.
If you switched to a 4 week cycle the round is worth more then a thousand pound a week.
If you were to ask for 3 or 4 months money for it, your looking at 12 to 16 thousand.
Though that might be considerd cheap. In the end it will only be worth what somebody is willing to pay.
The alternative is to sell it for say £5000.00 with a cast iorn contract that they pay you £300 every week for a year. It makes it cheaper to buy with the prospect of getting more money for your round over a period of time.
Nel.