Show where the tap is leaking
A drip from the spout, water around the handle and a leak beneath the basin describe different problems. Photograph the whole tap and any visible brand or model details. Ask whether a compatible washer, cartridge or seal is available before agreeing to a replacement tap.
Explain what happens after flushing
Does the cistern keep filling, does water continue into the bowl, or does the flush button fail to operate? Mention whether the cistern is exposed or concealed behind furniture. Water on the floor also needs reporting: a running flush and an external leak should not be treated as the same fault without inspection.
Compare the whole cost of each option
Request a repair option where practical and a replacement option if parts are unavailable or the fitting is deteriorating. Both should include labour, parts and any access work. If supplying your own tap or toilet, have the plumber check compatibility first and clarify who handles an unsuitable or faulty product.
Plan around your only toilet
Tell the provider if the property has only one WC. Ask how long it may be unavailable and what happens if a required part cannot be obtained during the first visit. For concealed cisterns, confirm how servicing access will be preserved once the work is complete.