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[Elite Pete]

You can rotate the cams individually, you need to be sure that you have 1,2,3 & 4 in exactly the the right position when the belt is fitted. If your markings are obvious you should be ok. You can move the cams using a socket on the front nut of the camsprocket. You will find a lot of tension at the 'top' of the turn and as/if you go past top, it will 'spring' (alarmingly if you've not experienced it before) to its next natural position. If the belt is not positioned correctly it can slip when you rotate manually which may be what you've experienced. Very important step though because you are in a position to and need to get it right before reassembly. Keep going, you will get there.

They don't have nuts

But they do have bolts.

A spanner can be used to rotate the cam but you don't want to be applying enough force to loosen the bolt. I prefer to use a home made peg spanner (engage the pegs in the circular holes in the cam sprockets).

The method is
1. rotate crank to 60deg before TDC (this moves all the pistons down the bores away from the valves)
2. use a peg spanner to align the cams with the marks on the backplate & fit the locking tools
3. wind the crank back to TDC & fit the belt.
4. do a compression test to check that all the cylinder pressures are the same (a bent valve won't seal properly)
 

To use a spanner would mean removing the cam covers, it's a torx bolt holding the cam sprockets to the cams

[devonian]

Well after a day spent in the pouring rain, i am relieved and pleased to say , she lives!! Sounds like a bag of spanners as i broke one of the pipes at the back of the breather bridge. BUt at least its running again....

In hindsight the job was not as difficult as i anticipated. However my caveat to anyone considering this is, dont do what i did, and get carried away. Take your time and you can do it. It took me a total of three days to complete , but that is solely down to my own haste and idiocy. (i did not tighten the tensioner or rollers properly and my belt slipped on rotation  ) You live and learn as they say 

Great thanks to all the help and kind words from members of this site!!