I work at Prestwick Centre and spend quite a lot of time on the West Coast sector 127.275 Mhz.
If you are IFR please file flight plans on the ground.
As mentioned above, please get your PPR/Indemnity sorted in advance.
If you are VFR please give us a call, we have pretty good radio coverage and normally a few Loganair flights above you who can relay info if necessary.
Radar services are available subject to workload, just ask.
As there is a lot of cumulo-granitus about, should you suddenly need to climb due to weather and continue IFR, either in an airway or outside CAS, we are there to help !