Item arrived safely and quickly, well packaged in its bubble packaging.
Once the casing is removed from the microwave, the old lamp can be out and the new one fitted in less than 30 seconds. Simply pull off two spade terminal connections and unclip the old lamp from its mounting. Clip the new lamp base into position and refit the electrical connections which are not polarity sensitive.
Caution! Sharp in their product manual state that only a qualified engineer should fit a replacement lamp - Not so, the lamp is mounted well away from any hazardous components, obviously observe normal safety measures such as unplugging from the power source before commencing any repairs and just be careful not to poke any tools or fingers into the microwave generator or other high voltage components mounted near the back of the microwave cabinet.
One final point, while searching the eSpares parts list for this replacement lamp, I could not find a lamp listed for my model R-959(SL)M-A microwave, but the photo image of this lamp appeared identical to what I needed. This particular lamp is listed as suitable for lots of other Sharp microvaves but quite specifically that it is unsuitable for my microwave.
Despite this I ordered this lamp (I could have been wasting a tenner), I knew the voltage and wattage matched the blown lamp's spec, I just wasn't sure from the photo whether the new lamp and its base was physically larger of smaller than the lamp being replaced. But - Hey Presto! - Identical in every respect.