Being retired and in lock down due to Covid for 2 years, I have only used our car for hospital journey's and occasional runs to keep the battery charged and things moving. I felt it necessary to fill up with fuel for the first time in almost 2 years. unfortunately I put premium petrol in instead of diesel at my local garage. only put 16 lt in as it kept spitting back as I tried to fill. There was around quarter of a tank of diesel in. Drove around 1/2 mile home with no problem but saw on my receipt that I had put Ultra unleaded petrol in. I intend to get one of the specialist tank drainers  to come out to my home as I feel driving to a service station could make things worse.

I would get someone to come to you to empty the car of fuel. As driven, would see if they can completely flush the system out as petrol in a diesel can do more damage than the other way around. (Although fuel nozzle stop you putting diesel in a petrol)

6 hours ago, Tomato said:

I would get someone to come to you to empty the car of fuel. As driven, would see if they can completely flush the system out as petrol in a diesel can do more damage than the other way around. (Although fuel nozzle stop you putting diesel in a petrol)

Matchetts seem to be the people to call. At least on my area. 
https://www.manchetts.co.uk/instant-quote/

 

Different seals used in petrol and diesel fuel systems. As the car has been driven needs checking that seals etc are OK.

Fuel spitting back as you fueled means that the petrol nozzle had triggered the safety flap to try to stop petrol being put in to the tank.