You will need a set of extension ladders (3.5-4.00 metres will be long enough), bucket, squeegees (12 and/or 14 inch channels), mop (applicator), selection of scrims or microfibre cloths, bucket on a belt, builders pouch or similar to put cloths in, safety scraper, notebook and pen, roofrack or bars for your vehicle.
£200-300 will cover the above and get you started.
Best wishes,
John