Yes bad time of year to sell.Sell if possible with a full mot.Good that its is low mileage,also what extras has it? ,leather seats?, electric seats? ect ect,good selling points.I bought my z4 2.5 last summer, with 63,000 miles for 3,000£s.It had long mot,no electric seats,it has leather.fair price i think. ps it still has 63 000 plus miles in December 2020 ,Dont use it much!