Thanks lads, appreciated. I bit my lip, stuck a mirror behind the block and there was no water from the welch plug. In fact all the water was coming out of the top bell housing/block bolt hole..!!!! The one I had not used due to the difficulty of access. After putting the bolt in no problems with leaks. I wouldn't have believed it unless I'd seen it. Must be a strange quirk with my 200 or perhaps everyone else bolts the bell housing back up with all the bolts. Thanks for the help, much appreciated. I'm just so relieved I don't have to pull the engine out again.
Fergus