underground pipe

So we’ve a straight run for the new kitchen, from an inspection chamber to a settlement rest bend (it gave us extra depth, to accomodate going under the foundation & to the depth of the inspection chamber invert) However the closest we could get the rest bend to the wall, leaves it 230mm away...

Looking at where to place an external boiler, and some guidance on best practice is needed! Very conventional system - heat-only oil boiler, fully pumped, Y plan, indirect cylinder, F&E tank, 7 rads, all in a 2 bed cottage. It's a spring-supplied system, not on mains, so there is only 0.5 bar...