I remember it well, and the unhappy aftermath. I was a director of the company behind the studio and, as such, gave a guarantee for the rent. After I left, Mark emptied the studio and left me with a £37k CCJ for the outstanding rent! Luckily for me, the landlord was sympathetic and never enforced the debt but the repercussions were severe, they cost me far more than money.
Getting back to the band, I seem to recall the guitarist using echo very much in the style of The Edge. The Jazz was a '66, and I've never really got on with them. The sunburst was probably my '66 also, and which I still own. The '51 was, in fact, 53. Oddly, it is featured in Haynes Fender Bass Manual, and even shows the certificate I got from John Entwistle (it was one of his old basses).
The pics would be amazing to see!