You can't spend your way out of trouble when at 100% debt to GDP and when the rates on new debt are extremely high, and when rates on old debt are moving on to the new higher rates. You get railed in three different directions.
It's even harder to do this when you can't grow quick enough to bail out that debt. It's growth which has largely bailed out previous debt, but when your hands get tied around your back for growth, in many ways, then this becomes extremely difficult and long winded. This is even harder when coming off the back of what's gone on previous and when the BOE are asleep at the wheel (but this is often the case with the BOE, it's not a new thing).
Labour have inherited the ultimate nightmare situation, I've been saying this for years, before labour were even winning in the polls (about the time I backed them to win the GE). It was obvious to me that this was all coming, yet a lot still seem to be denying this is the case. I was also saying it's going to probably take a term to stop the decline and another before things actually got noticeably better.