Thanks I'll look at any local bike shops as locating a park tool doesn't seem too easy in UK.
I can't see any missing spacers now that the cassette and freehub are all back on. I initially thought a spacer may have fallen off due to the amount of paly/wobble but as soon as I took the wheel off and the locking simply fell off, each cog was then free to call off , or slide off . I have mounted them back on in the correct order and I guess due to use each cog only fit onto the hub in a particular way - the groves must have some wear to them. ( Or that's their design).
With the locking tight the whole gear looks good. I just need a bike shop to fully tighten it now to road test.