Bikepacking UK - bike options

2 of us are hoping to link together a few of the wonderful routes in the UK, over a 6 week period June/July 2024. We are travelling over from New Zealand so looking at best option:

a) bring our bikes with us (least desirable option!)

b) rent (preferably for whole time, or could potentially do multiple short term options but could get messy!)

c) buy and either store "somewhere" before returning in 2025 to continue using... or alternatively buy and sell at end of 6 weeks.

Looking at Hybrid (have extensively used Trek F3) and will be bringing our own bikepacking bags, tent etc. So... wondering if any suggestions/clues as to companies to contact, particularly around the hire or buy/potential sell back options? We are flexible on locations, happy to utilise train system to get to start points etc. Also flexible on where we fly into as coming via (organised bike tour) Jordan and then Turkey. At this stage thinking will start biking Scotland/Hebridean Way and then make our way south to end London area.

Cheers, NnC