SO the Baxi leaks(pipework could be reattached), the pipework into the cylinder is incorrect(could be enlarged), the 3 year old hot water tank is corroded/ limescale buildup(I guess new tank), there is a buildup in all the pipe work of limescale(good flush out).
The system has been cobbled together , bits added over the past 15 years or so.
Currently we have 1 bath , 1 shower, 3 basins + daily washing machine ( hope to extend and add en-suite).
It has been suggested that rather than try to put this all right - we should spend alot of money (around £2000) on installing a VOKERA linea 24 combi. We would also need to replace our 5 year old shower with one that can run from a COMBI).
However I am concerned about comments I have seen on the WEB about problems with water pressure dropping in summer and the combi not working. Expensive maintenance cost, and build up of scale.
The plumber is long standing and highly thought of with over 30 years experience and a friend (who has just installed a combi in his house). - so I know hes not trying to rip us off - I just need to be conviced that his advise is current and correct.