A homeless hostel is getting ready to install a new kitchen after two strangers walked in and handed over cheques totalling £9,000.
After they started asking questions about the kitchen, he suspected they were environmental health officers and feared the hostel's ageing kitchen might not pass an inspection.
He said they had a look around, went away for 10 minutes, and came back to hand him the money.
Mr Mansfield-Clark said by the time he looked at the cheques, which were for different amounts of money from one bank account, and he realised how much they were for, the men had gone.
'Eternally grateful' The hostel still needs to feed people while the kitchen is closed
The anonymous donation brought funds raised for the kitchen to £37,000 after a £40,000 appeal.
Mr Mansfield-Clark is now hoping takeaway restaurants in the West Sussex town will step in and feed people when the kitchen is closed for three weeks during refurbishment.
He said he hoped each fast food outlet would cater for one evening and added: "With a bit of luck we'll get through the whole period with food for everybody."