Thanks everyone for your advice much appreciated, from an indecisive worry guts 
Seen this one higher than average mileage but full service history allegedly!
https://www.autotrader.co.uk/classified/advert/201710049945144?advertising-location=at_vans&search-target=usedvans&supplied-price-from=4000&supplied-price-to=5000&advertising-location=at_vans&postcode=en93na&model=DOBLO&sort=atcustomsup&page=1&radius=15&make=FIAT&version=b
Daz are you happy with leasing? I believe you are!
Are there alot of hidden extras like gap insurance?
Vanarama quoted me £200 a month 5 years on citoren berlingo with tlc package.
Everything covered servicing, tyres etc.
Just diesel and insurance.
Still not sure on leasing though 
Thanks everyone, great advice on warranties👍
I remember the magnet tip now, Spruce .
When I bought my other van a friend of the family came with me, he was an accident assessor and worked in the motor trade all his life.
Unfortunately he passed away to cancer a year after he had helped me 😡
most of these white fiat things your looking at come from the same type of place , either eurovan or north gate van hire (same group of companys as van monster ) all poverty speck vans with no toys in as they are cheaper to least , the cheaper the model the cheaper the lease most have had there head kicked in buy van drivers and dont care because its just a hire van
we had a daf truck on lease the because it had aic con ,we payed 14 pounds a week more on the lease ! just for that !
van monster keep there best stuff in there own yards and send the rest out to the sales , so all your buying is the same van you can go and buy yourself from the sales , however this is not for everybody as you need to do your sums before going and know what things are worth , also if these van stick in there yards they get dropped in price once then off to the sale after that , (so if i was you i would be going in to van monster evrey week and keep bidding them down these guys still have targets to meet )
anything nicer in the range of vans your looking at that have the toys and silver paint ect will be more £ because the the lease company paid more from them at the first point of sale which is a bit unfair as they have already charged more for to to be leased out this doesnt mean there any better of a van because the same drivers still beat them to death because there just hire vans
so you either want , ex bt,AA , gas vans because these drives keep there vans from day one until there out of least because they carry there own tools
these companys also like the drivers to keep the same van as it cuts out alot of bad driving and damage that cant get blamed on the the " last driver " which in turn make the driver look after his work van more because its his living/working space 12 hours aday (in most cases) so the driver/worker treats it like his own van
also all these companys run telamatic trackers where every mile of the drivers drive is looked at , including ticking over in laybys , hard stopping and harsh reving up the gears also all these companys limit there van to 70mph so again there not beaten to death meaning you have a better van to buy second hand which saves you £ over the long run hope this makes seance