I hope someone can give me some advise. I am building a small ensuite bathroom in an annexe which will be used occasionally. The plumber who did the central heating was made aware of my plans to put in an ensuite so left a hot and a cold tail on 15mm pipes which each pipe came off a 22mm pipe. This hot and cold needs to supply a compact toilet, a small basin and thermostatic shower and a downstairs compact sink. This annexe will only be used for occasional use (max of two people). Do you think these two 15mm hot and cold feeds will be adequate? or should I cut into the 22mm hot and cold pipe and take off additional hot and cold tails? Thanks in advance.