(see here) blue livery set was the default position. The new, improved fat-shape fiddle yard was the main player - it's tight, so some stuff fitted and some only in a certain order i.e. the Cl 150 would only work out of road 3 as in road 2 the longer wheelbase meant it reduced the foul point and clouted the Cl 108 parked in road 3. Flipped around and it worked. We are talking fag paper clearances here - Sprinters... no chance.
A green set of stock was tried, but there are massive gaps in the stud. The wildcard was an idea to use BR(S) pull-push sets (essentially DMU working style) this sort of worked on the layout proper until the obvious dawned that the locos wouldn't fit in FY roads 2 and 3. Doh! It did look nice though.
So after about 6+ hours of trying every piece of 16.5mm gauge stock in the house on it, it all came back to blue with a base stud of 150, 108, 121, 37, 25, with a Lima 40 as a spare which surprisingly fitted the headshunt… just. A brace of VDA vans and some MDV opens for a trip freight and CCT/NPV for parcels stock.