Spare or repairs kitchen tap (Radcliffe M26)

Quite an old tap but it was amazing for all the years i had it. It leaks from the case where the lever is and I don't see a way to fix it or dismantle it (but I may just not know?!?). Either way, if anyone would like to give it a go at fixing it, please let me know when can you collect. It's a retractable hose and I have the weighted blob that goes on the hose under the sink somewhere too.