Air tanker Lack of boom was solely reducing the upfront cost (it also reduces weight, which gives the Voyager a greater offload capability). The RAAF signed their A330MRTT contract in
2004. The RAF signed the air tanker contract in
2008. There was definitely a boom option available to them.
Even at the time I thought it an incredibly myopic decision, as the UK armed forces (as do Australia’s) normally operate in a coalition. And a significant amount, if not most NATO/ coalition fast air (usually vipers) are boom refuellers.